An update. Confirmed my grandfather was married to Joyce Lategan by comparing dates and handwriting on birth war and marriage certificates though my father was not aware of this or that he had a half brother Frederick My father was born in 1933 while James was still married to Jocelyn and my grandparents Marge and James were later married in 1937 although the 7 had been altered on the certificate to look like a 2! I have made contact with Fredericks daughter my half cousin and with the information we both had we could work it all out....my grandmother would be turning in her grave knowing that we have found out she had a child out of wedlock, she was very 'proper'