I visited Alec today & he was able to give me more detailed information about his belongings, that RAF Benson borrowed, but did not return. I have now e-mailed that information to Benson's PRO, so hope that this will help them in their search.
XV1979 Alec did not recognise your Grandfather's name, but said that Mount Farm was a satalite airfield, so sometimes he would fly some of the PRU pilots over there in an Anson, so they might well have rubbed sholders.