Original sentence: Coastal Command had three Beaufort torpedo-bomber squadrons in Britain, 42 Squadron at RAF Leuchars in Fife,  of 86 Squadron and 217 Squadron in Cornwall and seven 217 Squadron aircraft at Thorney Island (Portsmouth)
Edited sentence: Coastal Command had three Beaufort torpedo-bomber squadrons in Britain, 42 Squadron at RAF Leuchars in Scotland,  of 86 Squadron and 217 Squadron in Cornwall and seven 217 Squadron aircraft at Thorney Island (Portsmouth)