Principal Consultant Full Time NEW

Winchester, Hampshire
Gregory Martin International Limited

Principal Consultant – MOD, Defence, Government, Nuclear

Location – Winchester, Hampshire / Hybrid role

Salary: £70,000 to £90,000 plus bonus, medical, life insurance

The Opportunity

Our client is looking for a positive and enthusiastic Principal Consultant with demonstrable experience in developing Cat A 5-case model Business Cases within UK Ministry of Defence (MOD) and Government (Navy, Submarine, Army). This role combines a sound knowledge of consultancy delivery with strategic business case leadership, focussing on the strategic case and economic case, optioneering, evidence and approvals. It is an excellent opportunity to become a key member of a small, agile, and growing consultancy working at the heart of Defence transformation.

You will have excellent communication and interpersonal skills , strong stakeholder engagement skills and able to build collaborative relationships

You will work in a dynamic team with consultants, analysts and senior MOD stakeholders across a range of complex transformation programmes. This role will initially support Defence clients, delivering robust, evidence-based Business Cases that secure investment and enable successful delivery.

Skills & Experience required for role of Principal Consultant:

We believe skills and experience of the following will enable you to excel in this role:

• Extensive experience developing MOD Business Cases (SOC, OBC, FBC) for complex programmes, platforms, digital, data, or capability investments.
• Collaborative working with MOD finance, commercial, and assurance teams.
• Strong knowledge of HM Treasury Green Book, JSP 655 and Defence approvals processes.
• Proven ability to build compelling strategic, economic, commercial, financial, and management cases supported by robust evidence and analysis.
• Experience eliciting requirements, defining business processes, and developing target operating models in complex Defence environments.
• Knowledge of data analysis, benefits realisation, and performance measurement to underpin investment decisions.
• Requirements management.
• Capability Management.
• Experience leading senior client interactions and establishing trusted-advisor relationships on both short- and long-term engagements.
• Strong delivery leadership skills, including managing multi-disciplinary teams.
• Excellent written and verbal communication skills, with ability to influence at all levels.
• A positive, flexible, and collaborative approach, with a preference for building and working as part of high-performing teams.
• The ability to engage and enthuse personnel, and provide effective support and challenge, across all areas and at all levels within client organisations.
• Recent UK Defence Security Clearance (SC or DV) would be benefical.
• Qualifications-Degree, MBA or equiv experience , Project Management qualifications e.g. APMP useful.

The Principal Consultants role will include:

• Leading the development of high-value MOD Business Cases, including Strategic Outline Case (SOC), Outline Business Case (OBC), and Full Business Case (FBC), in line with HM Treasury Green Book and MOD approvals processes.
• Shaping investment strategies, options analysis, affordability models, investment appraisals, benefits cases, and value-for-money arguments to secure senior and investment approval.
• Working directly with MOD and Defence stakeholders as a lead business analyst and trusted advisor to help stakeholders agree the best option / strategy.
• Defining and analysing complex business problems, operating models, and capability gaps within Defence environments.
• Providing leadership, and leading teams across solution architecture and delivery oversight to ensure Business Cases are credible, deliverable, and benefits-led.
• Contributing to developing the company’s business case and analysis capabilities.
• Developing and managing senior client relationships, including SROs, programme directors, and commercial, finance, and assurance stakeholders.
• Building and managing relationships with delivery partners and specialist associates.
• A competitive package will be offered, based on your experience.

This is a hybrid role, you will be required to travel to client sites mainly across the Southeast, Southwest, London, occasional trips to other parts of the UK and Scotland.The role is a mix of client sites, office and home working.

Principal Consultant – MOD, Defence, Government, Nuclear