Chloe,
I didn't think that the Thomas Bestons I mentioned were your man, that would be too lucky!
But bear in mind that there were very strong traditions regarding the handing down of names in a family. This can be annoying sometimes, as the name a person is known by can turn out to be different to their "official" name when you find a record - but you can sometimes find clusters of one particular given name which can lead you to the source.
I have a "fuzzy link" in my own family because there were so many Thomas's, but I do know they are all in my family I just don't know who is the uncle and who is the daddy!
RonnieG