Hi anjo,
Happy new year to you.
I think you will find that Charles Mack was a boarder, un-married, aged 66, Clergyman and born in Westbury.
In the 1861 census he is recorded as Charles Meech (surnames first)
RG9/1298/26 P 20
Town; Bradford, Wilts;
others are Anne Carsh, 56. Esther Sainsbury, 70.
In the 1871 census he is transcribed as Charles Much, Lodger, un-married, aged 76, Clergyman .........., born Westbury
RG10; Piece; 1924. Folio; 34. Page; 8.
Town; Bradford, Wilts.
others are; Ann Caishe, 65, Elizabeth Robey, 70.
There is no mention of the name "Sylvanus" and I can send extract/copies if you would like them.
Alan