Wow! A tremendous amount of information.
I had found Eliza's three marriages but only in the civil registration so I did not have the exact dates or, more importantly, the names of fathers and witnesses. I now know she was Eliza Porter and married two widowers. What does "fa" mean please?
Wiggington seems to be the more common spelling at an earlier time. John who died aged 80 certainly seems a likely candidate for Thomas' father. I shall see if I can find any further traces of him, possibly in the Davetry area.
The George Porter/ Mary Wiggington marriage is also worth further investigation.
Thank you once again for all your help.
Hilary