RIP Geoffrey. There can't be many of "The Few" left now.
His book First Light is a fantastic read and well worth tracking down. He is very honest about the fear, jubilation, sorrow and about his own nervous breakdown brought on by years of aerial fighting. A true hero like the many others who gave so much for future generations.
Edited to add I think there was a TV drama I saw a few years ago documenting his career based on the book.