Further to the earlier posts, I have the following information:

Flt Lt Rashleigh was serving with HQ RAF Middle East. He was directed to join Flt Lt Balfour as his second-in-command of a special unit established to ascertain the possibilities of Aboukir, Castellorosso, Cos and Leros being used as bases for transport and mail services between Egypt and the Dodecanese Islands. Flt Lt Balfour has arrived at Leros on 24th September 1943 to ascertain the possibility of using Italian floatplanes that were reported as being stationed there. He subsequently discovered that Flt Lt Rashleigh's aircraft, a Naval Walrus on loan specifically for this mission, had been attacked and shot down by enemy Me109s on 30th September. The aircraft came down approximately five miles south east of Leros. No trace of the aircraft or crew was ever found. Flt Lt Rashleigh was flying with 1199632 Sgt Clifford Platt, his navigator, and carrying a passenger, Major Landon Royal Engineers.

The above is an extract from a letter I received from the Air Historical Branch in March 2003. Frank Rashleigh was my grandfather.