“Ending outsourcing by default” sounds like a major warning to organisations that provide services to the public sector. For many suppliers, it raises an obvious question: will public bodies still outsource services, or will more work be brought back in-house?
The answer is more balanced than the headline suggests. Public sector outsourcing is not ending. What is changing is the level of justification buyers may need before deciding to outsource. For suppliers, this makes evidence, value for money and early positioning more important than ever.
What Does ‘Ending Outsourcing by Default’ Mean?
The Government has announced a new Public Interest Test, requiring departments to assess whether a service could be delivered more effectively in-house before an outsourcing decision is made.
This is intended to move public bodies away from assuming outsourcing is the default option. Instead, buyers will need to think more carefully about the best route for the service, the people using it and the taxpayer.
The policy will apply to service contracts of £1 million and above, covering over 95% of central government spend. Departments will also be required to publish insourcing strategies, creating greater visibility around how they plan to review outsourced services.
For suppliers, the practical message is clear. Buyers may still outsource services, but they will need stronger reasons for doing so. That means suppliers need to make the case for external delivery earlier, not only when the tender is live.
This shift also sits within a much larger market. Gross UK public sector procurement spending reached £434 billion in 2024/25, so public sector contracting remains a significant route to growth for the right suppliers. The question is how clearly you can show that your service is worth buying.
Why Suppliers Shouldn’t Panic
This change should not be read as the end of outsourced public sector work.
Public bodies still need capacity, specialist skills, systems, operational resilience and market knowledge. Many services cannot be brought in-house quickly, affordably or effectively. Others may involve technical capability, workforce coverage or compliance requirements that are difficult to build internally.
In-house delivery now needs to be tested, not assumed. That cuts both ways.
If a buyer reviews a service and finds that external delivery offers better outcomes, better value or lower risk, outsourcing can still be the right decision. Suppliers that can prove this will still have a role to play.
The organisations most exposed are not necessarily those delivering outsourced services. They are the ones relying on historic demand, weak evidence or generic claims about capability.
A strong supplier response is not defensive. It does not argue that outsourcing is always better. Instead, it shows where external delivery is the right answer for a specific service, buyer and outcome.
Why the Public Interest Test Changes Supplier Positioning
Many suppliers focus their effort on the tender stage. They wait for the opportunity to be published, review the questions, gather evidence and write the response. That approach may no longer be enough.
Under this direction of travel, buyers may be asking a more fundamental question before a tender appears: should this service go to market at all?
This makes early market positioning more important. Suppliers need to help buyers understand what the market can deliver before the final procurement route is chosen. That could include evidence from existing contracts, service improvement data, cost comparisons, user outcomes, workforce planning, innovation and case studies.
The Sourcing Playbook already focuses on getting sourcing projects right from the start and is aimed at professionals involved in the planning and delivery of insourcing and outsourcing services. The new Public Interest Test adds further weight to that early planning stage.
For suppliers, this means your evidence should not be hidden away until the tender deadline. It should inform your sales activity, market engagement and bid strategy.
Thornton & Lowe’s Tender Pipeline can help suppliers monitor public sector opportunities, review awarded contracts and understand where future renewals may appear. That information is especially useful when buyers are reviewing whether to continue, change or bring services back in-house.
The Evidence Buyers Will Need
If buyers need to justify outsourcing, suppliers need to make that justification easier.
The strongest evidence will usually sit across these areas.
Value for money
Value for money is not the same as lowest price. Suppliers should show the full value of their delivery model, including cost control, productivity, service quality, risk reduction and avoided internal overhead.
A strong answer might show how the supplier reduces management burden, improves reporting, brings established systems or delivers savings through experience across multiple contracts.
Performance
Buyers will want confidence that the service can be delivered well.
Useful evidence includes KPIs, service levels, audit results, complaint trends, response times, improvement plans and contract outcomes. Where possible, use numbers. A claim about reliable service is weaker than a clear record of response times, completion rates or user satisfaction.
Specialist capability
Some services require skills, accreditations, systems or sector knowledge that are difficult to recreate in-house.
This might apply to facilities management, compliance-led services, specialist consultancy, digital systems, clinical support, training delivery or complex community services. Suppliers should explain not only what they do, but why that capability matters to the buyer.
Resilience
Public bodies need services that continue under pressure.
Resilience evidence could include workforce cover, business continuity planning, mobilisation capacity, supply chain control, regional coverage, escalation routes and contingency planning. This can be especially important for services affecting vulnerable users, public buildings, health settings or essential operations.
Innovation
Innovation should be practical, not vague. Buyers will want to know how a supplier improves services over time. This could include better reporting, automation, service redesign, improved user experience, new technology, carbon reduction or more efficient processes.
The important point is to connect innovation to a measurable benefit.
Public value
The National Procurement Policy Statement places public procurement within wider government priorities, including value for money, economic growth, social value and better outcomes. Suppliers should therefore be ready to evidence the broader value they create, not only the core service delivered.
This might include local employment, apprenticeships, supply chain opportunities, community benefit, sustainability, accessibility or improved outcomes for service users.
What This Means for Different Service Providers
The impact will vary by sector. A facilities management supplier will need different evidence from a training provider or digital consultancy. The principle is the same, but the proof points change.
- For facilities management and estates suppliers, buyers may focus on compliance, statutory checks, lifecycle value, response times, user satisfaction and operational continuity. Suppliers should show how they reduce risk and keep buildings safe, functional and cost-effective.
- For professional services and consultancy firms, buyers may look more closely at knowledge transfer, clear outputs, internal capability building and measurable return on investment. A strong bid should explain how the supplier adds value without creating unnecessary dependency.
- For technology and digital suppliers, the case may focus on security, integration, user adoption, data protection, efficiency and long-term support. Buyers will want confidence that external expertise improves service delivery without locking them into avoidable risk.
- For care, health and community service providers, the evidence should focus on quality, safeguarding, workforce stability, continuity of care, service-user experience and outcomes. These services are often too sensitive for generic value claims.
- For training and workforce providers, useful evidence includes completion rates, learner outcomes, employer feedback, skills impact and practical delivery capacity.
The key is to understand the buyer’s likely concern. Then provide evidence that deals with it directly.
How Suppliers Should Prepare Before the Tender
The best time to build your case is before the tender is published.
Start with your current contracts. Review what you can prove. Look at service performance, client feedback, improvement activity, savings, innovation and social value delivery. Then turn that information into evidence that can be used in sales conversations, market engagement and future bids.
This does not need to become an overcomplicated exercise. A useful preparation process might include:
- Reviewing current and previous public sector contracts.
- Identifying services most exposed to insourcing reviews.
- Mapping key buyers, renewal dates and contract history.
- Creating short, evidence-led case studies.
- Refreshing your value proposition by sector.
- Preparing clear responses on value for money and risk.
- Updating bid content so it reflects current delivery evidence.
This is where structured bid content management can help. Thornton & Lowe’s bid management software includes tools such as Tender Library and Tender Pipeline, supporting teams to manage bid content, monitor opportunities and reuse approved material more efficiently.
The aim is not to create generic copy. It is to make strong evidence easier to find, adapt and submit when the right opportunity arrives.
How to Respond When the Tender Comes Out
Once a tender is live, the supplier’s job is to connect evidence to the buyer’s decision.
Avoid defensive language. Do not spend the response arguing that outsourcing is always right. Focus on the specific service challenge and show why your delivery model is proportionate, credible and valuable.
A strong response should explain:
- why your model meets the buyer’s objectives
- how you will mobilise safely and quickly
- how you will work with internal teams
- how risks will be managed
- how performance will be reported
- how value for money will be achieved
- how users, staff or stakeholders will benefit
The bid should also make clear what the buyer gains by choosing an external supplier. That might be pace, resilience, technical expertise, service improvement, access to specialist systems or reduced delivery risk.
Thornton & Lowe’s public sector bid writing support helps suppliers turn evidence into clear, persuasive tender responses across central government, local government, housing, healthcare, education and other public sector markets.
Common Supplier Questions
Will public sector outsourcing stop?
No. The policy points to a stronger test before outsourcing, not a complete stop to outsourced services. Buyers will still use external suppliers where they can justify that route.
Will this affect every public sector buyer?
The announced Public Interest Test is focused on central government departments and service contracts of £1 million and above. However, wider public sector buyers may still be influenced by the same direction of travel, especially around value for money, insourcing and stronger procurement planning.
Does this make early market engagement more important?
Yes. Suppliers may need to help buyers understand what the market can offer before the final route to market is agreed. This makes evidence-led business development more important.
What should incumbents do now?
Incumbents should gather performance evidence, document improvement activity, strengthen contract reporting and show how they continue to create value. If a buyer is reviewing whether to bring a service in-house, weak contract evidence can make continuation harder to justify.
What should new entrants do?
New entrants should focus on credible mobilisation, relevant case studies and clear differentiation. Buyers need to see that a new supplier can improve outcomes without increasing risk.
How Thornton & Lowe Can Help
Ending outsourcing by default does not remove the need for public sector suppliers. It changes the standard of proof.
Suppliers that can show value, performance, resilience and public benefit will be better placed to compete. Those that wait until the tender is published may find they are joining the conversation too late.
Thornton & Lowe helps suppliers strengthen their approach before and during procurement. We support opportunity monitoring, market research, bid strategy, evidence development, tender writing and bid review. We also work with public sector buyers through our buyer-side procurement support, giving us insight into how value for money, supplier performance and procurement options are assessed from both sides of the process.
This matters because outsourcing decisions will increasingly need to be justified. Suppliers need to make that justification easier.
If you are concerned about how outsourcing reform could affect your pipeline, Thornton & Lowe can help you build stronger evidence, prepare for market engagement and submit clearer, more competitive bids. Speak to our team about bid strategy, tender support and how to position your service under the new procurement landscape.
