Thank you very much indeed for that link, Jan - it clearly showed Jonas' age at death as 64. The age of Johans at death that year would have been 72 or so, arguably quite an error, even for those days. Given the naming convention as well, I think the John Rich born 1712 is the better of the two possibilities, although this must be investigated more fully at a later date. To further muddy the waters, I also found a couple of baptisms for Jonas Rich in Yorkshire ......
Using your link, I was also able to look at the original marriage entry for Jonas Rich on 31 March 1741, and there is an extra word next to his forename. Although almost totally illegible, it could just possibly be a J starting it, raising the possibility that it is another forename. I think I would need to view the original document with a magnifying glass in order to confirm or refute that. Have you had a look at it?
But thanks again for your help in this.
