Hi Valda
Thanks again for your detailed response. You posed some interesting questions which I have tried to answer as follows:-
re Thomas' second marriage. I sent for two certificates on 11th Jan. Sarah's Death & Thomas' second Marriage to Sarah Thomas. They should arrive tomorrow or Wed.
His place of birth is Kensington on both 51 & 61. Turnham Green therefore remains a unresolved/mystery, why would George Edward have this as his place of birth. I had wondered about a connection between the first Sarah and TG.
The info you have found re Thomas Anderson and Sarah Duffin is essentially the same as mine. I have the actual parish record which says widower & widow. I have no way of connecting this Sarah Duffin to the death of Sarah Anderson in Feb 1840.
You mention Grosvenor Row, but this is in fact Yeomans Row.
6 Yeomans Row is the one factor that links everything apart from Edward Thomas Anderson 1826-1832.
George Edward, Edwin Thomas & Mary Sarah were all baptised together on 16/1/1842, abode = 6 Yeomans Row. I have Mary Sarah's birth certificate (yes - mothers maiden name Sarah Thomas), where born = 6 Yeomans Row. Sarah Anderson's (the first one) burial 20th Feb 1840 abode = Yeomans Row. The family of Sarah Mary Ann Thomas live in Yeomans Row (1841 census), parents and younger siblings. There are other facts that link the families from Yeomans Row to George Edward Anderson at his marriage in 1855.
Thanks for the tip re the police archives, I didn't know they existed.
All of which still leaves me to identify the maiden name of the first Sarah who died in 1840 and the probable mother to George Edward. I was hoping for some clue from the 1831 census. There are references to various lists in this post but some mention a visit to Chiswick library which I am not able to do.
http://www.rootschat.com/forum/index.php/topic,27992.msg402243.html many thanks