This post card was most likely taken at either the 1906 (Conway) or the 1907 (Towyn) Summer Camps – I favour Towyn.
Easily recognisable are:-
Captain Arthur John Hopkins (St Helen’s Lodge, Chesterfield)
Lieut HP Taylor (Grasshill House, Grassmoor)
Col.Sergt-Instr James Arthur Sturges (Drill Hall, Chesterfield)
Col.-Sergt J Harrison (St Helen’s Street, Chesterfield)
Sergeant James Needham
Sergt John H Platts