I have had a quick look in our book 'Flat Out' and cannot find his name in the index. That is not to say he isn't mentioned but the book does cover the period when your grandfather was on the Sqn.
This is not a sales pitch for the book but if you are interested it is published by 'Air Britain' through Amazon and it,s ISBN is 0-85130-308-0.
I hope this helps in some way and you never know, someone might pop up with more information on your grandfather. It might help if you gave some more information about his trade, rank, where he served on the Sqn etc.