Like many others here, I never met Arthur, but I have a copy of his book too and would recommend it to everyone. He came across as a real "Total Aviation Person" and I'm sure he'll be sadly missed by anyone who knew him.
I seem to recall seeing him in the BALPA mag a couple of years ago, something to do with a record for the longest interval between flights in the same aircraft (60odd years?), which I believe was a Tiger Moth? Perhaps someone better informed could expand for me.
RIP Capt Whitlock