Well, thanks again Ken, and thanks again everyone else for the interest and links. My interest in this grave is this. My mother-in-law was Mildred Cotter of Accrington (born at the Moorlands Maternity Home on 12/08/1926). In 1944, she married Harold Yerdon, whose grave we've been discussing, but he was killed just three weeks later in a training flight. The Lancaster he was in crashed in Tingrith, Bedfordshire, quite close to where the M1 is now.
Mildred received a pension from the RCAF until she married again (to my father in law) in 1953, when the pension was stopped. Strangely, the Canadian government decided in the late 1980s to start paying these pensions again, that is, for widows who'd remarried. Mildred and her mother visited Canada in the early 1950s, and they visited Harold's family but they "weren't interested" apparently.
While I was aware of the outline of this story, I've recently been contacted by a woman who's looking for information to publish on
Bombercrew.com – A Tribute to Heroes of RAF Bomber Command, so I started looking for more information also. In addition to the links that have already been posted in this thread, I also found a tribute on-line to one of the other men who died in the accident:
Harvey Irwin - Veterans Affairs Canada
At the moment, I don't have a lot more information than this but I'm still looking. Do keep in touch any of you if you'd be interested to hear more when I find it.
That aside, can I say what a great experience I've had of "AccyWeb". It's great to know there are people about who'll help just for the satisfaction of helping. I'm in Windsor so I can't imagine I can offer help in return but do let me know if I can return the favour in any way. That's to you mainly Ken of course, but also to anyone else listening.
Speak soon.
Alan