The 2003 Defence White Paper, titled Delivering Security in a Changing World, set out the future structure of the British military, and was preceded by the 1998 Strategic Defence Review (SDR) and the 2002 SDR New Chapter, which responded to the immediate challenges to security in the aftermath of the September 11 attacks in 2001. Published under the then Secretary of State for Defence, Geoff Hoon, the report effectively introduced a series of cutbacks to core equipment and manpower and the scaling back of a series of future capital procurement projects. This was justified due to the implementation of a policy termed Network Enabled Capability. The review also outlined a major restructuring and consolidation of British Army Infantry regiments.
The White Paper, scaling back to an extent from the previous Strategic Defence Review, outlined the following posture for the UK armed forces:
Most of the reforms listed below were announced as part of the Delivering Security in a Changing World: Future Capabilities review, published on 21 July 2004.
The review also mentioned "significant" classified enhancements of British special forces, including strength increases and investment in new equipment.
Financially, in a Treasury spending review announced the week before, the budget would rise by £3.7bn from £29.7bn in 2004/2005 to £33.4bn in 2007/2008. The review also mentions £3bn to be invested into procuring new helicopters over the next ten years.
The future regimental structure of the British Army, after changes were outlined in the review was announced in December 2004. Significant changes included: