osprey, This whole thread is quite convoluted! You don't need to apologise - just think of my stuff-up when I said there were no Cath* H* THOMAS births

It would be great to hear
a) exactly where Catharine Howell THOMAS was born and the names etc of her parents,
and
b) exactly where Catherine THOMAS & William VENABLES were married!
One has to wonder whether those marriage witnesses were connected in any way or just happened to be people who were standard witnesses at the location where they were married ...
And IF ONLY the inquest report could be found and if only there were newspaper reports!
Kassie, Do please post the marriage cert info.
It would be interesting to get more info on the possible Thomas THOMAS e.g. his Mate's certificate - but that wouldn't clear up or confirm any connexions.
Arranroots, Please keep offering suggestions

I have a 'feeling' that this puzzle has a solution which will be found

No, I'm not 'fey' in any way - it's probably just wishful thinking

JAP