I really don't think it will be easy to confirm or disprove the little story I made up from the facts... it makes sense, but there are, of course, other explanations. I looked for a birth registration that might fit - there do seem to be a couple that are spot on - but there are pages and pages of Mary Ann Williamses born in London during the relevant period - and I just don't have the money to send for birth certificates - each one costs over $16.00 Canadian, of course. It's something I'd really like to know, but I'm afraid will have to remain a speculation.
There is, however, no mystery about their son Matthew being my g-g-grandfather... there are too many facts that link together, not the least of which is that there are very few Matthew Weeks to begin with, and only one that hails from Crudwell. I have a pretty strong chain to show this... including census records and copies of marriage certificates. It also helps that he moved to Scotland... the only other Matthew Weeks born in England in the right period died in Cornwall, I believe.
I can't locate the parish records online for Thomas and Hester... (Hester was born in Brokenborough, not Crudwell, as I stated mistakenly in the last post) - I'd like to find the records of their births, marriage, and the date of Thomas' death if I can, especially since those would likely give me the names of their parents.
I've been pretty nearly stonewalled every time I try to search for my ancestors in parish records; the relevant records just do not seem to be online.
I did manage to get some of my Scottish ancestors but that's about all; I'd love to come over to the U.K. and spend some time looking for records (and have a beer in the Green Gardens Pub in Rochdale where my namesake great - grandfather probably raised his glass as well) but it's not in the cards unless I win the lottery.

Stephen