I don't think anyone will be able to help with details of the marriage in 1950 you would need to obtain their marriage certificate
Marriages for London England & Banns only go up to 1921 and Surrey marriages up to 1937 on Anc*y
If you know these person to still be living you should remove their full names
I think the only way forward would be to obtain their marriage certificate which will give you
his age, his father's name their occupations etc... then you can move on from there hopefully finding his birth entry
Certificates can be ordered from the GRO
http://www.gro.gov.uk/gro/content/here's the details of their marriage entry
Jul-Aug-Sep 1950 Lambeth
Volume Number: 5c Page Number: 3321