« Reply #13 on: Monday 06 June 11 13:46 BST (UK) »
The option of Margaret Sarah Collett being his mother does not reveal any obvious marriages but lots of Margaret and Sarahs as follows
Valentine Collett
marriage: 09 Apr 1787 —Saint Leonards Shoreditch
spouse: Sarah Hellett
Thomas Collett
Marriages 1538–1973
Marriage: 24 Nov 1791 —St. Mary'S Whitechapel Middlesex
spouse: Sarah Gatehouse
Thomas Collett
marriage: 24 Nov 1791 —St Mary'S Whitechapel Middlesex
spouse: Sarah Gatehouse
William Collett
marriage: 31 Mar 1795 —Saint Bride Fleet St
spouse: Sarah Wittle
Stephen Collett
marriage: 26 Dec 1799 —St. Mary'S Lambeth Surrey
spouse: Sarah Cowell
John Collett
marriage: 30 Dec 1800 —Saint Bride Fleet St
spouse: Margaret Davies
William Collett
marriage: 09 Nov 1800 —Spitalfields Christ Church Stepney
spouse: Sarah Randall
John Collett
marriage: 06 Jan 1801 —Saint Giles Camberwell Surrey
spouse: Sarah Harrison
William Collett
marriage: 25 Jul 1802 —St. Mary'S Whitechapel Middlesex
spouse: Sarah Williams
Thos. Collett
marriage: 03 May 1802 —Saint Nicholas Deptford
spouse: Margaret Edwards
William Collett
marriage: 25 Jul 1802 —St Mary'S Whitechapel Middlesex
spouse: Sarah Williams
Robert Collett
marriage: 24 Apr 1766 —Saint Leonards Shoreditch
spouse: Sarah Smith
Moat, Potter, Seddon,Routledge, Sutton, Holliday,Bestford, Allison, Allen/Allan, Lascelles, Forster, Dudgeon, Collett, Wills