Very helpful, Owen - thanks. Would anybody be able to shed light on a tangental topic: some territorial battalions duplicated themselves during the Great War and again when the outbreak of hostilities looked inevitable in 1939. For instance, 4th Bn Essex Regiment spawned 1/4th & 2/4th and the 5th became 1/5th & 2/5th. In the First World War, there was (initially?) a distinction between them, with the '1st line' battalions being posted overseas and the '2nd line' battalions remaining at home, but this distinction (almost inevitably) broke down and people went wherever they were posted. I'd like to know whether there was still much (or any) of a distinction in the Second World War? In theory or in reality? Certainly, a number of 2/4th officers and men were drafted to replace casualties suffered by the 1/4th, but equally a lot of their reinforcements came from the Gloucestershire Regiment.