Hi Jill
No, historically the Tunwell's came from Norfolk and London, the bulk of them settled in Cambs in the 16thc.
I think this Richard may have been a stray from London, but the connection with the Davies family is interesting.
Apparently the 1841/1851 census throws up a Richard ^ Sarah Tunwell living in London, with Sarah having been born in London, this may well be this couple.
Thanks
Again
David