This paper summarises UK defence expenditure (historic, current, and planned), international comparisons of defence expenditure of NATO Allies, and the financial cost of UK military operations.
This document provides an overview of how UK defence spending is currently defined (as well as its historical definition), explains the difficulties in comparing defence expenditure internationally, details how NATO defence expenditure is reported (particularly the 2% target), and how the cost of UK military operations is calculated.
Dempsey, N. (2018) UK Defence Expenditure. House of Commons Briefing Paper Number CBP 8175. Available at: <https://researchbriefings.parliament.uk/ResearchBriefing/Summary/CBP8175#fullreport>.