Hello Jinks
Apologies for the late reply.
Actually, the mystery deepens. I've had an e-mail from Central Library in Liverpool which states that there was a Janet Passe living there in 1949, but I have no idea who she was. I can't see a re-marriage for my grandfather, but of course, it may never have happened! So, I'll have to try to trace her, but whether she was my grandfather's wife or not, I have no idea.
Thank you again for your interest.
Alice