Key Takeaways
- Defence contracts impose security, compliance and reporting obligations that go well beyond standard commercial terms.
- The Procurement Act 2023 governs relevant defence and security public procurement, subject to national security exemptions.
- DEFCON terms and flow-down obligations can bind suppliers who never contract directly with the MOD.
- Intellectual property provisions and export controls affect how defence technology is developed, licensed and transferred internationally.
- Seeking legal procurement advice before tendering, not after signing, is the most effective way to manage contractual risk.
- A procurement solicitor can advise on tender review, DEFCON conditions, subcontracting, IP rights, export licensing and procurement disputes.
Protect the Bid Before Legal Risk Becomes Operational Risk
For UK manufacturers, technology developers and specialist SMEs, winning MOD contracts or securing a position in a prime contractor’s supply chain can represent a significant step forward. But the legal obligations involved are unlike anything in standard commercial contracting.
Security requirements, intellectual property restrictions, complex procurement arrangements, export controls and strict compliance obligations can all affect whether a public sector contract that looks commercially attractive actually remains so once delivery begins.
Legal risks in defence procurement are not always visible in the headline contract terms. They can be embedded in incorporated conditions, flow-down obligations from higher tiers of the supply chain, and statutory frameworks that apply regardless of what the contract says.
A legal issue can quickly become an operational problem if a supplier cannot meet a security condition, obtain the necessary export authorisation or manage a flow-down obligation it did not fully understand when signing. This is why specialist legal advice from a procurement solicitor with defence sector experience should be considered at the earliest stages of the tender process, not after problems arise.
How Public Procurement Law Applies to Defence Suppliers
The legal requirements facing a defence supplier depend partly on who they are contracting with. Supplying the Ministry of Defence (MOD) directly is not the same as manufacturing components for a major defence contractor, even when both contribute to the same programme.
The Legislative Framework
The Procurement Act 2023 introduced significant changes to UK public procurement law when it came into force on 24 February 2025, including provisions specifically addressing defence and security contracts. The legislation allows certain exemptions and additional flexibility where defence or national security requirements justify them. Procurement procedures commenced under the previous legislation may remain subject to the earlier rules.
Direct Suppliers and the Supply Chain
An SME supplying a Tier 1 defence prime may be entering a private sector commercial agreement that incorporates conditions inherited from larger public contracts. Although the subcontractor does not generally have the same procurement challenge rights as a direct bidder, certain statutory protections, including payment obligations under the Procurement Act 2023, may still apply.
Obligations can travel through several contracting tiers. A supplier might never deal directly with the MOD but still find itself responsible for:
- Security and vetting requirements originating from a classified programme several tiers above
- Technical assurance and reporting obligations passed down through the prime’s subcontract terms
- Payment and compliance conditions inherited from the original public contract
Understanding which legal procurement rules apply, and which obligations have been passed down, is an essential starting point before committing to any defence supply arrangement.
What a Procurement Solicitor Can Help Assess
Tender Documentation and Contract Terms
A procurement lawyer with defence sector experience can advise at each stage, helping suppliers identify which commitments are reasonable, which require clarification and where further contractual protection is needed.
Reviewing procurement and contractual documentation before submission allows suppliers to identify issues while there is still an opportunity to address them. Bidding for public sector contracts of this nature requires a clear understanding of what is being committed to at each stage of the procurement process.
For businesses entering MOD contracts, the wording of the agreement deserves particular attention. These government contracts commonly incorporate DEFCON terms, the Ministry of Defence’s standard contract conditions. The MOD’s defence procurement guidance sets out information on the conditions that may be incorporated, each addressing a specific area of contractual responsibility.
Suppliers should also consider how the agreement addresses the following:
Provision | Key questions to resolve |
Liability and indemnities | What is the financial exposure? Is appropriate insurance available? |
Warranties | What commitments exist on quality, specification and performance? |
Payment and termination | What are the consequences of delays, disputed performance or early exit? |
Change control | How do revised specifications affect cost and delivery obligations? |
Dispute resolution | What procedures apply when contractual disagreements arise? |
A contract must be examined as a whole. Sound legal advice considers not only what each clause says, but how those clauses will operate together if circumstances change or a dispute develops.
Flow-Down Obligations and Subcontracting
Flow-down obligations (conditions covering confidentiality, security, intellectual property, quality assurance and reporting) can be passed down through several levels of the supply chain. A supplier that accepts them without ensuring its own subcontractors can meet the same standards takes on a risk it cannot fully control.
The MOD’s Industry Security Notices address security requirements for classified work, including the passing down of applicable conditions to subcontractors. For SMEs working within larger defence programmes, two things are essential:
- Supplier due diligence: understanding the capability, security posture and compliance readiness of every organisation involved in delivery.
- Properly drafted subcontracts: ensuring obligations accepted upstream are accurately replicated downstream, with appropriate remedies if a subcontractor fails to meet them.
Intellectual Property and Technical Data
For businesses developing specialist equipment, software or manufacturing technology, intellectual property can be one of their most valuable commercial assets. Defence contracts may distinguish between background IP, which exists independently of the contracted work, and foreground IP, which is developed during delivery. Ownership, licensing and permitted use depend on the contractual terms and any applicable third-party rights.
The MOD’s standard contract guidance discusses DEFCON 705, under which contractors generally retain ownership of intellectual property generated through the relevant work while granting specified rights to the authority.
However, different MOD contracts may incorporate other intellectual property conditions. The scope of these rights, including modification, sublicensing and onward use, can significantly affect the commercial value of the technology. Agreeing to overly broad provisions could affect a company’s ability to develop similar products or supply other customers.
Proelium Law examines these issues further in its article on intellectual property advice for defence and security businesses.
Security, Compliance and Supplier Assurance
Suppliers handling sensitive information, classified material or technology connected to military programmes must demonstrate they can meet the standards expected by government and prime-contractor customers. Depending on the contract, this may include personnel vetting, secure information handling, incident reporting, quality assurance and record retention.
The MOD’s Industry Security Assurance Centre guidance explains requirements for protecting classified information, including the role of Security Aspects Letters (SALs). The specific security obligations depend on the contract and the classification of the information involved. Failure to meet applicable requirements may prevent a supplier from securing a contract or result in contractual consequences where obligations are breached.
Export Controls, Dual-Use Goods and Export Licensing
Where military equipment, sensitive technology or dual-use goods (items with both civilian and military applications) are transferred internationally, UK export control legislation applies. The Export Control Joint Unit (ECJU) sets out when an export licence is required.
Export licensing obligations extend to technical data and software, not only physical goods. Sharing design files, specifications or source code with an overseas party may require a licence even where no physical item crosses a border. An agreement to deliver goods or services does not override these restrictions, and where licensing prevents or delays a planned transfer, the consequences can extend to contractual obligations and commercial relationships with prime contractors.
Proelium Law has examined these issues further in its articles on ECJU export licensing criteria and the legal implications of dual-use drone technology.
When to Seek Procurement Legal Advice
Specialist advice from procurement lawyers should be considered at each stage of the procurement lifecycle, including:
- Before tendering, to identify obligations that could affect pricing, resourcing or technical feasibility.
- When reviewing MOD contracts, to assess DEFCON terms, liability provisions and incorporated conditions.
- When appointing subcontractors, to ensure flow-down obligations are accurately reflected and supplier capability assessed.
- When protecting intellectual property, to negotiate ownership and licensing terms before rights are inadvertently transferred.
- Before entering international supply arrangements, to address export control requirements and sanctions considerations.
- When responding to contract variations, procurement disputes or compliance concerns, where early legal support can limit liability and preserve commercial relationships.
Where a bidder believes a contracting authority has breached public procurement rules, timing is critical. Under Section 106 of the Procurement Act 2023, procurement challenges are generally subject to a 30-day limitation period, although limited extensions may be available in certain circumstances. Delaying legal advice can significantly restrict a supplier’s options for pursuing a legal challenge to a procurement decision.
How Proelium Law Supports Defence and Security Suppliers
Proelium Law LLP is a specialist law firm, not a conventional one. Founded by professionals with direct experience across military, intelligence, legal and international security sectors, the firm understands the operational environments in which defence businesses work, not just the legal frameworks that govern them.
Proelium Law advises on procurement, contractual obligations, regulatory compliance and disputes across the full range of defence and security contracting. For broader support across contracts, export controls and operational risk, explore Proelium Law’s defence and security legal advisors service.
For specialist defence and security legal advice, contact Proelium Law.
Frequently Asked Questions
What Does a Procurement Solicitor Do for Defence Suppliers?
A procurement solicitor advises on tender documentation, contractual obligations, liability and subcontracting arrangements. In a defence context, a procurement lawyer can also review MOD contracts, assess DEFCON conditions and advise on obligations passed down from prime contractors, helping suppliers understand what they are committing to before they sign.
Why Are Defence Procurement Contracts Different From Standard Commercial Contracts?
Defence contracts carry additional obligations on security, technical performance, intellectual property and reporting. Suppliers can also find themselves responsible for conditions originating from government or prime-contractor agreements several tiers above their own.
What Are DEFCON Terms in MOD Contracts?
DEFCON terms are standard contractual conditions used by the Ministry of Defence, covering matters such as security, intellectual property and quality assurance. The MOD’s defence procurement guidance sets out information on the conditions that may be incorporated.
Do Defence Suppliers Need to Consider Export Controls?
Yes. Certain military and dual-use goods, software and technology are subject to export controls under UK legislation. International transfers may require an export licence from the Export Control Joint Unit. Export licensing obligations also extend to technical data and software, not only physical goods.
When Should a Defence Supplier Seek Legal Advice?
Ideally before submitting a tender, signing a contract, appointing subcontractors or entering international supply arrangements. Suppliers should also seek legal advice when contractual changes, procurement disputes or compliance concerns arise, and before any statutory procurement challenge deadline expires.