William L Davidson married Isobel Simpson in Fulham in 1933. They had a daughter, Kathleen in 1937, registered in Marylebone.

I've searched marriages from 1956 to 1961 for Kathleen's marriage and have come up with these.
1956 - 1961
1956 Married a Wilson in Hackney
1956 Married a Penfold in Dartford
1956 Married a Greenwood in Newbury
1960 Married a Nevitt in Brighton
1961 Married a Wood in Ware.

As you can see you could carry on all day. Still need more info.