INFORMATION:

T - Tents
H - Hangars
Red circle may have been cannon stop butts or a fourth Blister hangar?
H - Pre war civil hangar.
Two steel matting runways.
Sqdn's that used Selsey were 33, 65, 222, 245, 329, 240, 341, 349 & 485.
Air of Authority - A History of RAF Organisation

Spitfire.