[Merry]

Oh, this would make sense:

Name: Susannah Tuly
Gender: Female
Marriage Date: 12 May 1817
Marriage Place: Upper Winchendon, Over Winchendon, Buckingham, England
Spouse:
Jack Venimore
FHL Film Number: 1999820

If that's the marriage of Elizabeth's mother when Elizabeth was aged about three, it would seem reasonable that Elizabeth might use both surnames in later life when her children were registered

There's entries for Sus* Ven?more on the 1841, 51 and 1861 censuses in Waddesdon. I don't know if they are all the same woman (probably are) - ages are 45, 70 and 73!

There's this death:

VENEMORE, SUSANNAH 73
GRO Reference: 1861 S Quarter in AYLESBURY Volume 03A Page 279

EDIT - Just like buses, as well as the marriage I posted above, on FMP I saw this:

Record set Buckinghamshire Marriage Index
Marriage date 12 May 1816
First name(s) Joseph
Spouse's marital status spinster
Sex Male
Spouse's residence Upper Winchendon
Last name Venimore
By licence or by banns Banns
Marriage year 1816
First witness John Mander
Spouse's first name(s) Susannah
Second witness Mary Ricket
Spouse's last name Tuly
Third witness John Andrews
Denomination Anglican
Register type Marriages
County Buckinghamshire
Register year range 1813-1837
Country England
Archive reference PR233/1/7
Place Upper Winchendon
Archive Buckinghamshire Archives
Document type Parish registers
Category Birth, Marriage, Death & Parish Records
Page 5
Subcategory Parish Marriages
Marital status bachelor
Collections from England, Great Britain
Residence Upper Winchendon

As they are from different datasets and the date is the same except for the year, I'm assuming they are records of the same marriage. Jack or Joseph though? Possibly Joseph was abbreviated and then mistranscribed? I can't find an image anywhere.

Whatever J his name was, I don't see a burial for him.