Thanks for that Steph. I will add it to the enormous pile of info I have and one day, who knows, it may all link together.
Since my original post, I have found the parents of the family of Cooks who regularly changed to Carwell and Carwell Cook. They were John and Charlotte Carvell!! They had all their children in Wavendon, Bucks.
I haven't found their marriage, so don't know if Charlotte was a Cook. I haven't found the birth/bpt of John in Wavendon or Bucks.
In recent weeks I have found some interesting entries on the IGI that are a possibility:
Daniel Carvel who married Catherine Cook, 9.11.1769 in Lilbourne, Northants. They had a son, John in 1770.
And Richard Carvel and Mary Cook who had a son John in 1769 - in Market Harborough, Leics.
Both are 40 miles or so from Wavendon ( a quick nip up the M1 now!). I guess I'll never know if either are the parents of John Carvell.
Incidentally there is another marriage - much earlier, in Chesham, of Thos. Coock and Hannah Carvil on 7.12.1707!
It's so frustrating!
Regards,
Diane