Frustratingly Sarah is never with a husband but I guess we could look for a butler on his own somewhere doing his job *
1861 St Pancras Middlesex
Sarah 31 butlers wife
Walter 2
Ellen 1
Piece 104 folio 35 page 66
* Aha there's a Thomas on his own who is a butler in Paddington Middlesex

1861 age 32 servant occupation butler born Tunbridge Kent 1829. Must be him surely.
There's a possible marriage in Marylebone Jun 1858
Thomas Wenborn Sarah Singer or Sarah Beard.
Other groom John Seward.