In the workhouse ... which Scrivener?

Another 3xgreat-grandparent may have ended his days in the workhouse, although I have yet to tie up various bits of information that would verify the connection. My 2xgreat-grandmother Harriet Scrivener's birth certificate of 1851 in Luton shows her parents as William Scrivener and Hannah, formerly Hawkes.

The 1871 census shows a Harriet of the right age living with her parents William and Hannah at 23 Stuart Street, Luton (where Harriet’s illegitimate son was born in 1872). William Scrivener was probably born sometime around 1815, in the Luton area or Limbury, Bedfordshire (if working back from the 1871 census). He was then working as a groom and recorded, like the rest of the family, as having been born in Luton. His marriage to Hannah Hawkes is recorded in the parish registers of St Mary Luton at the Bedfordshire and Luton Archives Services (BLARS):

1836 - William Scrivener of this parish bachelor Hannah Hawke(s/r) of this parish spinster Married in this church by banns this 8th day of February 1836. The mark X of William Scrivener The mark X of Hannah Hawke(s/r), in the presence of us The mark X of James Hawke(s/r) the mark of Elizabeth Scrivener (?).

Hannah disappears from the censuses after 1871 and her death certificate shows she died in 1874 at Stuart Street, Luton, aged 59 years, of a 'diseased liver'.  So what happened to William after her death? The 1881 census shows a William Scrivener living at Church Street, 1 Waldock's Garden, Luton, with daughter Sarah, aged 24. This Sarah also appears on the 1871 census. William's birthdate now appears to be around 1811.

There is also a death record of William Scrivener, aged 75, in the March quarter of 1886 in Luton, which would fit with the 1811 birthdate.  Also for William aged 78 in March 1892, in Luton, which would be roughly in line with the later census birth year of around 1814.  I ordered both certificates to see if there was any way of telling which is which.  The first of these certificates (1886) is for William, wife of Silvia, from Dunstable and so discounted.

In the 1891 census, there is a William Scrivener, born Luton 1814, listed as a pauper/general labourer in Luton Union Workhouse.  This may be the same William who died in 1892 and the resulting death certificate ties these two records together.  However, this William was also in the workhouse at the time of the 1881 census, shown as born in West Hyde, Bedfordshire, a groom so can't be (?) the same William Scrivener born in Limbury, shown in the 1881 census with daughter Sarah. The death certificate of this William shows he died on 17th January 1892 in the Union Workhouse, Luton USD, aged 78 years. He is described as a 'groom - not domestic' and died of 'valvular disease of heart, asthma' (yes, another one!).