The British Army has less than 100,000 personnel and under 50,000 Reservists in 2020 .
Following the Strategic Defence and Security Review 2010 ( SDSR ) and the Strategic Defence and Security Review 2015 the British Army adopted an evolving structure ( known as Army 2020 Refine ) that would see the number of Regular personnel set at 151,000and see an increase in the number of Reservists to 70,000 .