The prospective bridegroom would appear to be Alexander Edward William LONG, who, per company records, was born in July 1985 (his birth was registered in August 1985 in Lambeth, mother's maiden surname LINEHAN). His parents would appear to be Richard M LONG and Linda LINEHAN, whose marriage was registered in Wandsworth in Q4 1981.
Per company records, David Claringbold PILTON was born in October 1932; per probate records, he died on 26 February 1996. Per company records, his wife, Mrs Kathleen Worsdell PILTON, was born in August 1930; however, this appears to be the wrong year, as her birth was registered in Eastry, Kent, in Q3 1931.