 In due course land was acquired to the north-east, and from 1889 the establishment expanded on to a 'New Range', which encompassed Foulness and Havengore.The Experimental Branch (part of the School of Gunnery since 1859) became an independent operation in 1905 (it was renamed the Experimental Establishment in 1920, and the Proof and Experimental Establishment (P&EE) in 1948, before becoming part of the Defence Test and Evaluation Organisation (DTEO) in 1995).In 1920 the School of Gunnery was redesignated as the 'Coast Artillery School' of the Royal Garrison Artillery, following the move of the Field Artillery and Horse Artillery equivalents to a new establishment (the School of Instruction for Royal Horse and Field Artillery) at Larkhill.