Hello again Ron,
Thanks again for the info regarding the book, I was able to buy a copy of it on eBay.
I'm making a ultra low budget documentary on a motorcycling theme and as part of it I filmed a dear old 93 year old gentleman who was in the RAF and rode Indians. He talks of having been in Jerusalem, amongst other places in North Africa, and may well have been at this base.
I also note with interest from the photo of the parade that at that time the bikes seem to have been painted in camouflage just like the planes and that the RAF roundel looks to have been divided across it'