The defence sector in 2026
The UK defence industry employs over 160,000 people across prime contractors (BAE Systems, Rolls-Royce, Leonardo, Thales, MBDA, QinetiQ, Babcock), tier 1 and tier 2 suppliers, and the Ministry of Defence (MoD) civil service. The sector has seen increased investment following Russia's invasion of Ukraine and the subsequent increase in NATO defence spending commitments — the UK committed to 2.5% of GDP on defence spending in 2024. Key programmes: Type 26 and Type 31 frigates, Ajax armoured vehicle (famously troubled), Typhoon jet fighter, F-35B for the RAF and Royal Navy, Trident nuclear deterrent, and emerging AI, drone, and cyber programmes. Understanding the specific customer (MoD, NATO allies, export customers), contract type (cost-plus, fixed price, framework agreement), and programme stage (concept, assessment, design, production, in-service support) of roles you apply for is important.
Security clearance questions
"What level of security clearance do you hold, or would you be willing to apply for?" UK security clearances: BPSS (Baseline Personnel Security Standard — the minimum for civil service and defence contractor roles, checks identity, employment history, right to work, criminal record), SC (Security Check — standard for access to SECRET information, requires five years UK residency), DV (Developed Vetting — for access to TOP SECRET and above, highly intrusive, requires extended UK residency and deep background investigation). Most defence engineering roles require SC as a minimum; some classified programmes require DV. Non-UK nationals, people with significant time abroad, or people with certain financial or personal history complications may find SC or DV difficult or impossible to obtain — this is a practical constraint worth understanding before applying to classified roles. "Are you comfortable working on military systems?" Ethical considerations around working in defence are legitimate and often raised. Prepare a genuine, considered answer.
Commercial and programme questions
"What is the difference between a cost-plus and a fixed-price defence contract?" Cost-plus: the government pays the contractor's actual costs plus an agreed fee or profit rate. Lower risk for the contractor (no financial penalty for cost overrun) but lower incentive for cost discipline. Used for high-uncertainty or developmental programmes where the final cost cannot be estimated reliably. Fixed-price: the contractor delivers for an agreed price regardless of actual cost — any cost overrun comes from the contractor's margin. Higher risk for the contractor, stronger cost management incentive, and better for the government when requirements are well-defined. Many large UK programmes (Ajax, Astute submarines) have suffered from poor initial requirements specification leading to significant cost and schedule overruns regardless of contract type. "What does programme management mean in a defence context?" Defence programmes span decades, involve multiple prime and sub-contractors, and must satisfy rigorous MoD and NATO standards (DEFCON, DEF STAN). Show understanding of the programme lifecycle, milestone reviews (CDR, PDR, SDR), and the importance of requirements management.
Behavioral questions
"Tell me about a time you worked on a programme with strict safety or quality standards." Defence engineering demands exceptional rigour — products must work reliably in extreme conditions and failures can cost lives. Show: your personal commitment to quality and process, not just compliance with mandated procedures. "How do you approach working within a complex supplier network?" Defence programmes involve many tiers of suppliers with complex interdependencies. Show: coordination skills, understanding of interface management, and experience working across organisational boundaries.