The two Warners who were living together in Shefford in 1851, uncle and nephew, appear to have died in 1852 and 1853 in Biggleswade registration district. I don't suppose you have the death certs which should give ages and thus differentiate them? One or other of these, probably the younger, seems to have married in the Sep quarter 1851 in St Martin in the Fields, London, to Harriett Odell. The licence dated 28 Jul 1851 shows that Warner was of the parish of Compton (sic) in the county of Bedford, a bachelor (both Warners were bachelors in 1851). Compton looks to be an error for Campton, in which parish Shefford was situated.
It is the second Warner ( b. 1807 at Woodhall) that is a puzzle as I can find no records of him on the census and only a possible death record in St. Lukes 1847.
See a 2007 thread on this board which explains all -
http://www.rootschat.com/forum/index.php?topic=260328.10. There's a lot of information about Warner in this thread. He was 42 at death, a policeman.
Now it gets embarrassing, as when looking for inspiration for Warner Green in Ancestry trees I find that I have the 1807 Warner in my own tree, only because he married into my Daniel family from Southill. I also failed to realise that I'd done work on him for the 2007 thread. I show him as marrying Mary Elizabeth Whitteridge Spencer at St Andrew Holborn on 2 June 1834, both otp. She was born in wedlock, and was baptised as Whitteridge age 26 at Haynes Beds in 1834, shortly before she married, so I've no idea why she used the surname Spencer. I had established her maiden name as Whitteridge from the 1851 census living in St Luke with her brother William Whitteridge - Mary Green head widow 41 Lodging house keeper b Beds; children Elizabeth 14*, George 12, Mary Ann 9, Samuel 6, Fanny 3, all born St Luke; William Whitteridge brother unm 30 b Haynes, Beds. In 1841 her mother Martha née Daniel, and siblings were living at Peerless Row, St Luke, enumerated as Whittridge.
I can't find Warner or his eldest daughter Elizabeth in 1841 but living at Pool Terrace, St Luke were Mary E Green, not born in Middx, & George Green 2 b in Middx. The 2007 thread shows that their son Samuel was born at 22 Pool Terrace, taken from his birth cert, so this is the right family.
So it seems more than likely that it was the Warner Green baptised in Meppershall in 1807 who married Mary Elizabeth Whitteridge from Haynes, Beds in Holborn and he was the one who died in St Luke Middlesex in 1848 age 42. But as he was otp when he married in Holborn and as we can't find him in 1841, there's no nice neat link between Meppershall and St Luke. But it's the right Warner!
David
* There's an interesting baptism in Hoxton on 5 March 1890 of Elizabeth Sarah Green, born 16 Jan 1837, daughter of Warner and Mary Elizabeth, policeman. Mary Elizabeth Whitteridge's birth is registered in Cotton End Independent & Baptist Church book, so it looks as though she continued to be non-conformist after her marriage which is why I can't find infant baptisms of any of her children