Hi B.E.
1861: Oxbridge, Netherbury, Dorset RG9 / Piece: 1364 / Folio: 37 / Page: 20
Head: William VINCENT 36, Labourer,
Wife: Mary VINCENT 35, Labourer's wife
Lodger: Henry GILLHAM 15, unm, apprentice,
All b. Netherbury.
In the household next but one bf them is a GILLHAM family:
William George GILLHAM 27, a shopkeeper, his wife Francis 36 & chd: George 4, William 2, Henry 2mths plus a boarder Joseph CHILCOTT 80, retired Fisherman.
Francis & Joseph (I suspect her father) born Burton, rest b. Netherbury
In the household next but one bf the GILLHAMS is:
Head: John TIZARD 28, Ag Lab,
Wife: Sarah 28
Dau: Jane 5
Thomas 2
Robert 1 mth
All b. Netherbury
All have Oxbridge as their address
Here's an old Rootsweb topic on the Netherbury VINCENTS - including brief mention of your Mary marrying William. He was 1 of 10 children. In 1841 Census his father, Robert was enumerated as VENSON - it may have been an 'accepted' old name variation:
http://archiver.rootsweb.ancestry.com/th/read/DORSET/2004-02/1076222910Cheers
AMBLY