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The UK government is ending 'outsourcing by default', introducing a Public Interest Test for service contracts of £1m and above and requiring departments to publish insourcing strategies. Announced in March 2026 and reinforced in June, the phased reform could gradually reshape work for outsourcers such as Capita, Serco and Mitie.

Key takeaways

  • The government has announced the end of 'outsourcing by default', with a Public Interest Test requiring departments to consider in-house delivery before contracting out.
  • The test applies to service contracts of £1m and above, said to cover around 95% of central government service spend, and departments must publish insourcing strategies.
  • A written ministerial statement on 17 June 2026 confirmed plans to bring building management, including cleaning and security, back in-house across 83 government buildings from 2028 as contracts expire.
  • Listed outsourcers with significant public-sector work, including Capita (LSE:CPI), Serco (LSE:SRP) and Mitie (LSE:MTO), could see their pipeline of public contracts affected over time.
  • The reform is phased rather than immediate, and large volumes of public services are still expected to be delivered externally; the practical impact will depend heavily on execution.

Britain is rewriting the default setting for how it buys public services. In a shift confirmed during 2026, the government has moved to end what it calls 'outsourcing by default', requiring departments to consider whether services could be delivered better in-house before they are contracted out. Announced by the Cabinet Office on 26 March 2026 and reinforced by a written ministerial statement on 17 June, the reform introduces a Public Interest Test for larger service contracts and obliges departments to publish strategies for rebuilding in-house capacity. It is a measured, phased change rather than an overnight upheaval, but for an outsourcing industry that has spent three decades winning government work, it represents a meaningful reset of the terms of trade.

What the government has announced

The centrepiece is a change of presumption. Under the reforms, set out as part of a package to modernise public procurement, departments must actively assess whether a service can be delivered internally before deciding to outsource it, and explain their reasoning transparently. The government frames this as rebuilding the capacity of the state and using public spending to support a fairer economy, rather than as a blanket ban on private provision.

According to the Cabinet Office, some £400bn of public money is spent on government contracts each year, so even incremental changes in how that spending is directed carry weight. The insourcing measures form one strand of a wider reform effort that also includes backing British industry in areas such as steel and shipbuilding, and simplifying the bidding process for smaller firms.

The Public Interest Test explained

At the heart of the change is the Public Interest Test. Before outsourcing a service, departments must weigh factors such as long-term value for money, the impact on the wider economy and market, social value, and whether the state has, or could build, the skills and infrastructure to deliver the work itself. The test is reported to apply to service contracts of £1m and above, a threshold the government says captures around 95% of central government service spend.

The practical effect is to reverse the burden of proof. Where outsourcing was previously the path of least resistance, in-house delivery becomes the option to consider first, with outsourcing requiring positive justification. The government has described the change as one of the most significant to the procurement landscape in a generation, though its real-world impact will depend on how rigorously the test is applied across departments.

Insourcing strategies and the first concrete steps

Alongside the test, departments are required to publish insourcing strategies, medium-term roadmaps setting out how they will rebuild skills and capacity to deliver services internally over time. For technology and business-process work in particular, departments with large annual spending in this area are expected to produce multi-year plans, signalling that the ambition extends beyond one-off decisions to a structural rebalancing.

The written ministerial statement of 17 June 2026 gave an early, tangible example. The Cabinet Office set out plans to bring building management services, including cleaning and security staff, back in-house across 83 government buildings, among them Downing Street and the Cabinet Office itself. The changes are timed to begin from 2028, when existing contracts expire, and remain subject to completing the Public Interest Test, illustrating how gradual the transition is intended to be.

This phasing matters for interpretation. The government is not proposing to tear up existing contracts, but to change what happens as they come up for renewal. That means the effects will accumulate over several years rather than landing all at once, giving both departments and suppliers time to adjust.

Why the policy is shifting

The intellectual backdrop to the change includes a decade of scrutiny of outsourcing. The 2018 collapse of Carillion, a major government contractor, prompted parliamentary inquiries and lasting questions about the risks of relying heavily on a small number of large suppliers. More recent controversies over the delivery of public-facing services have kept the issue politically live and strengthened the argument for rebuilding state capacity.

Proponents of insourcing argue that keeping services in-house can improve accountability, protect the quality and terms of employment of front-line staff, and avoid the profit margin and management fees that come with contracting out. They also contend that an over-reliance on external providers can hollow out the skills the state needs to be an intelligent client, leaving it dependent on suppliers it struggles to hold to account.

The case for outsourcing

There is a substantive counter-argument, which the government's own framing acknowledges by stopping short of a blanket ban. Supporters of outsourcing point to the flexibility, specialist expertise and investment that private providers can bring, and to competitive tension that can drive down costs and spur innovation. For complex technology projects or specialist facilities management, the private sector often holds capabilities that would be expensive and slow for departments to build from scratch.

Critics of a rapid insourcing drive also warn of transition costs and execution risk. Bringing services in-house requires recruiting and retaining staff, absorbing pension and employment liabilities, and building management systems, none of which is guaranteed to be cheaper or better. The evidence on whether insourcing saves money is mixed and depends heavily on the service, which is why a case-by-case test, rather than a blanket rule, is the approach the government has chosen.

What it means for the big listed outsourcers

For the listed companies most exposed to UK government work, the reform reshapes the long-term opportunity set. Capita (LSE:CPI), Serco (LSE:SRP) and Mitie (LSE:MTO) all derive a meaningful share of revenue from public-sector contracts spanning administration, justice, defence-related services and facilities management. A presumption in favour of in-house delivery could, over time, reduce the flow of new contracts or the scope of renewals in some areas.

The impact is unlikely to be uniform. Highly specialised or capital-intensive services, where the state lacks in-house capability, may remain outsourced, while more routine functions such as cleaning, security and basic administration look more exposed to insourcing. The written statement's focus on building management is an early signal of where the initial pressure may fall, though individual contract decisions have not yet been detailed.

It is important not to overstate the immediate effect. The reform is phased, existing contracts run their course, and large volumes of public services will still be delivered externally for the foreseeable future. Much will depend on how departments apply the Public Interest Test in practice and how suppliers adapt their offerings towards the more specialised, higher-value work that is harder to bring in-house.

Investor and shareholder implications

For shareholders, the key variable is visibility over future revenue. Outsourcers are valued in part on the length and security of their contract backlogs, so any change that increases uncertainty around public-sector renewals is likely to feature in how investors assess the sector. That said, a phased policy that plays out over years allows companies to reshape their pipelines and pursue commercial and international work to offset any softening in UK government demand.

This article does not offer any view on the merits of these shares or make any prediction about their prices. The point is narrower: government policy is one of several factors that bear on the outlook for companies heavily reliant on public contracts, and this reform adds a new consideration that investors and management teams will need to weigh alongside contract wins, cost control and diversification.

The wider procurement reform

Insourcing is only one part of the package. The government has also moved to prioritise British industry in procurement, including expectations that prime contractors use UK steel or justify not doing so, and measures aimed at protecting shipbuilding and other strategically sensitive sectors. Separately, it has sought to simplify bidding for small and medium-sized enterprises, including a 'tell us once' principle to cut duplicated paperwork and a revised definition of social value.

These strands share a common thread: using the state's substantial purchasing power to pursue economic and social objectives, not simply the lowest headline price. For suppliers of all sizes, that implies a procurement environment in which factors such as domestic supply chains, employment practices and community impact carry greater weight than before, changing what a winning bid looks like.

The direction also sits within a longer arc of procurement change. The Procurement Act, which overhauled the rules for how public bodies buy goods and services, already gave departments broader scope to weigh value beyond price and to design contracts around wider objectives. The insourcing reforms build on that foundation, using tools that are now embedded in the framework rather than inventing an entirely new system. For suppliers, that continuity means the shift, while real, is an extension of a trajectory that has been under way for some time rather than a sudden break with the past.

Economic and public-finance context

The reform lands at a time of continued pressure on the public finances, which sharpens the stakes on both sides of the argument. If insourcing genuinely improves value for money and service quality, it could support tighter control of spending over the long run. If transition costs prove high or in-house delivery underperforms, the savings could disappoint, so the government's insistence on a case-by-case test rather than an ideological rule is significant.

There is also a labour-market dimension. Shifting services in-house affects the terms and security of employment for large numbers of workers, from cleaners and security staff to administrators and IT specialists. Trade unions have broadly welcomed the direction, while parts of industry have urged caution, reflecting the genuine trade-offs involved in reorganising how public services are staffed and delivered.

Key risks and uncertainties

Several uncertainties temper the significance of the announcement. The first is delivery: policies that change the default can still have limited effect if departments lack the skills, funding or appetite to insource in practice. The second is scope: much depends on how the £1m threshold and the Public Interest Test are applied, and on which categories of service are judged suitable for in-house delivery.

A third uncertainty is timing. With flagship changes tied to contract expiries from 2028, and technology-focused measures phased in over the following years, the real economic effects will emerge slowly and could be shaped by future political and fiscal conditions. As with many procurement reforms, the gap between stated ambition and delivered outcome is where the story will ultimately be decided.

What to watch next

The most informative signals will be the insourcing strategies that departments publish, which should reveal how far the ambition extends beyond building management into larger, more complex services. Early decisions as major contracts approach renewal will show whether the Public Interest Test is being applied with real force or treated as a formality.

Watchers will also track how the listed outsourcers respond, including any shift in strategy towards specialist services, commercial clients or international markets, and how they characterise the policy in their own reporting. Guidance from the Cabinet Office on how the test should be operated will help clarify where the balance between in-house and outsourced delivery ultimately settles.