My grandparents I believe were landlords of the above pub during the 1930's. Their names were Harry (John Henry) Adkin and Marie. They had a son Billy who died when a Baby (1929 I think) and a daughter Jean (my mum). If anyone has any information I would be extremely grateful.

There was no marriage for a Marie to an Adkin, and in this context, " I think " means, you don't know.

You're going about this back to front, what you should be doing is working backwards from your mother.

What was was your mother's year, month, and place of birth. ?

Also her full forenames if she had more than one.