Hi,
My Tombs are from Tredington & Elmstone Hardwicke & Forthampton - see Wm Good's website. It's a step from Turkdean, but you never know.
Have you tried alternative spellings? I've found the surname in my line spelt
TOMS, TOMMS, TOOMBS - others could be THOMS, TOMMES, TOMBES
There is a John Tombs mentioned in Forthampton in 1708 (when his daughter Mary was baptised), but can't find a marriage in the Parish.