Ahh, I wondered where/what Beverstone was !
Wonder if this is a case of confusion between Westbury on Severn aka FoD and Westbury on Trym aka Bristol or Westbury Wiltshire ?

That said the Marriage Records tie up...and possibly several subsequent generations of William Paces in FoD.

Searching Laterday Saints site I only find ONE entry for William Pace in Gloucestershire and none for Thomas:

England and Wales Census, 1841 for William Pace

Name: William Pace
Event: Census
Event Date: 1841
Gender: Male
Age: 25
Birthplace: Gloucestershire
Record Type: Household
Registration District: Monmouth
Sub-district: Coleford
Civil Parish: Newland
County: Gloucestershire