Data Centre Colocation: Infrastructure Choices, Investment Economics and Commercial Strategy

Introduction

A three-part commercial briefing series examining what organisations should do with their existing data-centre infrastructure: retain it, refresh it, relocate owned equipment into colocation, procure managed hosting or migrate workloads to cloud services. The series connects market dynamics and sector demand with business-case decisions, procurement competition and long-term contractual control

The commercial context

Many organisations still own and operate servers, storage and networking equipment supporting critical applications. As facilities age, support contracts approach renewal and new hosting options become available, they must decide whether to keep their infrastructure where it is, refresh it, relocate it into a third-party data centre or replace the underlying operating model. Those decisions affect continuity, expenditure, supplier responsibilities and the ability to modernise over time.

The available choices extend beyond keeping a data centre open or moving everything to public cloud. Organisations may refresh their own equipment, move owned servers into a colocation facility, outsource the infrastructure and its operation, migrate selected workloads to cloud platforms, modernise applications or replace them with software as a service. Several arrangements commonly coexist. The location of equipment, its ownership and the responsibility for operating the service are separate decisions, even when supplied under one contract.

Each choice changes what the buyer purchases and which risks it retains. Moving owned equipment to colocation changes the facility arrangement but can leave hardware support, software and operations with the customer. Supplier-owned hosting transfers equipment responsibilities into a recurring service charge. Public cloud provides access to computing resources without the customer owning the machines, but migration, configuration, cost management, recovery and application support still require clear ownership.

The commercial question is how to sustain reliable services while selecting an operating model that remains affordable, secure and adaptable. Equipment may have useful life remaining even as organisational strategy changes. A cloud programme may take longer than envisaged, extending maintenance and colocation commitments. Savings expected from decommissioning or internal resource reductions must be assessed against expenditure that can genuinely be removed.

The series therefore follows the investment decision from understanding the market and infrastructure options, through the business case, to the procurement strategy and the continuing management of the supplier relationship. Financial analysis is pitched at business-case level, concentrating on material cost lines, assumptions, financial exposure and achievable benefits.

A colocation market shaped by cloud adoption, capacity and changing buyer requirements

The infrastructure market comprises different but interconnected supplier groups: commercial data-centre operators, colocation specialists, infrastructure and equipment providers, cloud platforms, managed-hosting businesses, migration integrators and independent hardware-maintenance companies. Their services may compete for an organisation’s budget while also complementing one another. Increasing public-cloud use does not eliminate physical data-centre demand because cloud platforms themselves depend on extensive facilities and power capacity.

Demand varies by service requirements as well as sector. Central government departments manage interdependent legacy and digital services; NHS organisations must consider clinical continuity and vendor-supported systems; councils face different estate, capability and financial constraints; universities combine corporate applications with specialist research computing. Financial services, manufacturers, logistics businesses and other private-sector operators bring further differences in resilience expectations, regulatory obligations and technology investment.

Region matters where it affects connectivity, physical access, power availability, recovery separation and engineering coverage. The location of the customer, the live workload and backup or recovery facilities may differ. Security classification, data-protection obligations, operational criticality and resilience standards must also be distinguished: they can materially alter the supplier pool, delivery model and cost, but do not automatically dictate one hosting solution.

Public procurement adds a distinctive market-design question. Government Commercial Agency’s Crown Hosting II (RM6262) is a single-supplier colocation framework, running to 6 October 2029, with direct award against catalogue prices. Its centralised assurance, terms and purchasing arrangements offer potential benefits, while the absence of call-off competition raises questions about continuing price discovery, supplier choice, innovation and value testing. Competition at the original framework award and competition for individual customer requirements are different matters.

The availability of a central framework is also different from its uptake. The series will examine how eligible NHS bodies, councils, universities, departments and other organisations access colocation and hosting, how alternative frameworks, direct procurements, shared arrangements and bundled managed services affect purchasing behaviour, and what this reveals about market access and supplier competition.

What the three-part series covers

Part 1 — Keep, Relocate or Replace?

Infrastructure Strategy, Market Dynamics and the Hosting Decision

The opening briefing establishes the meaning and commercial boundaries of an on-premises data centre, equipment refresh, direct and managed colocation, supplier-owned managed hosting, dedicated or private cloud, public-cloud infrastructure and software as a service. It distinguishes physical relocation from rehosting an application in cloud infrastructure, and both from replatforming, redesigning, replacing or retiring an application.

It examines the market structure and principal providers across colocation, regional and specialist hosting, equipment, hyperscale cloud, migration and ongoing managed services, including independent third-party maintenance. UK market growth, investment, capacity constraints, consolidation, innovation, supplier economics and credible available market-share evidence provide context, with clear separation between the total data-centre market and the public sector’s directly purchased services.

Demand is compared across central government, NHS bodies, local authorities, higher education, emergency services and relevant private-sector industries. The analysis considers workload suitability, equipment condition, service continuity, application dependencies, internal capability, funding, environmental responsibilities and resilience. Regional capacity, connectivity, location of data, disaster recovery and the commercial consequences of differing security requirements complete the appraisal.

The briefing explores how demand for direct colocation, owned-equipment maintenance, managed hosting and migration changes as organisations modernise at different speeds. Published customer examples are used where evidence supports them, without presenting unsupported public-sector workload splits or universal sector preferences.

Key consideration: Understanding which infrastructure choices are actually available, which suppliers and demand factors shape them, and when maintaining a mixed estate offers a credible strategic and operational rationale

Part 2 — The Economics of Hosting and Cloud Migration

Whole-Life Cost, Investment Returns and Financial Exposure

The second briefing examines how an organisation develops an options appraisal for retaining, relocating, outsourcing or replacing its infrastructure. It considers the decision as an investment over the relevant service and contract lifecycle, with financial depth appropriate to a senior commercial business case rather than a detailed engineering cost model.

Principal cost lines include equipment acquisition and refresh; property and facility expenditure; colocation space, power, cooling and connectivity; hardware support; managed services; software licensing; cloud consumption; security, backup and recovery; internal skills; migration and testing; temporary dual running; and decommissioning. Capital and revenue implications are considered alongside budget affordability and long-term contractual commitments.

The analysis examines the credibility of cash savings, cost avoidance, productivity improvements, resilience benefits and service improvements. It distinguishes forecast efficiencies from expenditure that can actually be released, including cases where vacating a server room or outsourcing an activity does not immediately reduce buildings or staffing costs. Whole-life cost, ROI and payback are used as decision measures without excessive financial modelling.

Pricing and commercial exposure are considered through minimum space and power commitments, energy pass-through, indexed charges, reserved cloud capacity, consumption discounts, professional-services rates, software licences and currency movements. Migration delays, changing workload volumes, spare capacity, renewal timing and exit obligations are explored through proportionate sensitivity analysis.

The article also considers the different incentives of facilities operators, cloud platforms, migration integrators and managed-service suppliers. It asks how the buyer obtains credible options advice where the recommending supplier may also benefit from the selected delivery model.

Key consideration: Establishing a defensible business case that recognises the material costs, achievable benefits, implementation uncertainty and financial flexibility of each infrastructure model

Part 3 — Procuring and Managing the Infrastructure Estate

Supplier Selection, Commercial Structures and Contractual Control

The concluding briefing follows the sourcing journey from stakeholder requirements and market engagement to procurement strategy, supplier evaluation, negotiation, contract award, transition and continuing supplier management. It distinguishes buying physical colocation from procuring hardware maintenance, a managed-hosting service, migration capability and public-cloud consumption, recognising that each service can require a different commercial structure.

It examines Crown Hosting II in detail: the rationale and potential benefits of centralised buying, the framework’s single-supplier and direct-award structure, catalogue pricing, assured services, flexibility and governance. The commercial analysis asks how pricing and service quality remain tested during the framework term; how central purchasing leverage can be demonstrated; and what market entry, buyer choice and supplier innovation look like when call-off competition is absent. It considers the original framework competition separately from ongoing award arrangements, without assuming the single-supplier design is inherently ineffective.

Alternative purchasing routes are examined across NHS trusts, councils, universities, other public bodies and private-sector organisations. The briefing distinguishes GCA cloud and technology frameworks from physical colocation routes, alongside other eligible public frameworks, directly advertised procurements, sector collaborations, shared services and managed-service contracts that bundle facility and infrastructure provision. The assessment considers why eligible organisations may select different routes, what evidence of actual use is available, and how route selection shapes supplier choice, commercial leverage and accountability.

A substantive forward-looking section evaluates possible design principles for a successor Crown Hosting arrangement. Options include retaining a central single-provider model with stronger benchmarking and review mechanisms; a multiple-supplier arrangement with competed call-offs; regional, security or service-specific lots; and, where appropriate, open-framework structures allowing new suppliers to join at defined intervals. It tests the trade-offs among scale, price discovery, security assurance, standardisation, delivery capacity, switching complexity and the certainty required for supplier investment. These are commercial design questions, not predictions of GCA policy or an assertion that any model has already been selected.

Supplier selection and contract negotiation cover facility resilience, connectivity, security assurance, engineer and spare-parts coverage, migration experience, service integration, pricing transparency, scope boundaries, indexation, contractual flexibility and business continuity. Particular attention is given to bundled versus separately contracted services and responsibility when faults occur across the facility, customer-owned hardware, network, cloud platform and application.

Contract management considers measurable service levels, incident response and restoration, operating and consumption reports, supplier governance, change control, asset retirement, performance remedies, transition assistance and exit. The Procurement Act 2023 and the applicable position for legacy frameworks, devolved procurement and contracting authorities are addressed where materially relevant to the buying decision.

Key consideration: Determining whether procurement arrangements sustain meaningful market competition, purchasing efficiency, supplier accountability and value for money throughout changing infrastructure requirements—and how future framework design might improve the balance

Who should read this series?

The series is intended for Chief Procurement Officers, commercial directors, CIOs and chief digital officers, technology procurement leaders, infrastructure and operations directors, finance directors, digital transformation leaders, security and information-risk professionals, and contract and supplier-management teams across central and local government, the NHS, higher education and emergency services.

It is also relevant to private-sector technology and finance leaders, data-centre operators, colocation providers, cloud platforms, managed-service businesses, migration and maintenance suppliers, investors and advisers assessing UK infrastructure demand, route-to-market choices and long-term commercial commitments.

What the series brings together

The briefings connect the physical infrastructure market with application and workload decisions, the business case for change, buyer-sector requirements and the ways public and private organisations procure and manage hosting. They consider competition and framework design alongside technical and operational assurance, reflecting how a sourcing decision can shape available options for many years.

The financial treatment remains proportionate: significant cost drivers, cash savings, cost avoidance, productivity, service improvements, investment returns and financial risk are examined at business-case depth. Supplier prices are considered through commercial structures and mechanisms rather than unsourced rate comparisons or granular calculations.

For organisations considering a data-centre exit, renewing colocation, planning cloud migration, reassessing maintenance or questioning the value delivered by a purchasing framework, the series provides an integrated commercial perspective on the decisions that govern expenditure, operational continuity and future flexibility.

Three briefings. One connected examination of existing infrastructure, data centre colocation, the business case for change, and the competitive and contractual arrangements that determine long-term value.