Jon and I are trying to narrow the info down to find his exact place of birth,without that there would be no way to find which record office you could visit.
Normally births are easily found on https://www.freebmd.org.uk/
and you would then be able to get a birth cert.But Dennis's one is eluding us all.
We need to prove where the family were living when he was born to know which church they would worship under............London is a big place!
Do you have his Canadian marriage cert,does that give anymore info that could help us?