Hi, Richard -
I didn't find Thomas's burial, as I ended my sub to Find My Past and have lost access to the NBI. I shall have to buy the CDs!
But David DID find it - see his post on 19 July.
As for Mary Tatman's positive identity, I am not sure that there is ANY definitive data that would prove or disprove that she was Mary Crawley. In those days, marriage entries were pretty bald - how much information was included beyond the basic names and date was pretty much up to the cleric making the entry. You might get lucky and have a witness with the appropriate family name which would add weight, or in some cases even find a comment in the margin about some unusual aspect of the marriage.
You usually have to work on balance of probability. I believe that Mary Tatman was *probably* Mary Crawley - because:
1. There are no other fits from the data available. Though this can be deeply misleading, as data can be missing altogether, unavailable, missed out of transcriptions, or wrong in Bishops Transcripts etc etc ad nauseam. However, we do know that Bedfordshire is reasonably well covered.
2. The places in which Mary and Thomas lived, worked and married are all in pretty close proximity to each other.
3. The marriage was by licence, implying haste, at a time when most people of this status simply waited the required three weeks to be married by banns. Either that, or Mary wasn't going to be resident in Northhill for long enough for banns to be called, though she is described as "of Northill".
4. Mary Tatman Jnr was born in Cople within five weeks of the marriage. There's a possible implication here that Mary was sent away from her home village to have her child out of sight of the gossips, but having married the father, she was allowed to come home. I did explore the possibility that she was sent to a relative in Northill, but this seems unlikely. I can't find any relationship between her and the William Linnell of Northill who stood for the marriage bond. (Pity his name wasn't Tom, Dick or Harry Crawley!) Another theory might be that she left Cople briefly to be married out of sight of the village gossips, so as not to draw still more scandalised attention to her burgeoning belly at the altar! Or perhaps she had to run away briefly to marry Thomas, as her parents were opposed, even given her pregnancy? Or perhaps the vicar in Cople just wouldn't marry her because she was a naughty girl? Remember there is a slim possibility that she had already had one illegitimate child with Thomas Tatman - the young man who died in Cardington in 1814.
Any way up, I think there's a strong probability that the Mary who married Thomas Tatman in Northhill in 1792 was Mary Crawley baptised in Cople 1770.
As for proof, I would say that it is highly unlikely to be forthcoming.