This page was added to show what the RAF rescue laucnh / seaplane tender looks like. It tends to show up a lot…
ROYAL AIR FORCE 1939-1945: COASTAL COMMAND © IWM (CH 11075)
There’s an interesting volume by Caste Hill Press called Boats for the RAF, focusing on the work of T.H. Lawrence (yes, that one) helping developing the RAF high speed launch. A most enticing volume, and I would recommend it to myself were it not for the wrong service.