« Reply #1 on: Friday 02 April 10 11:56 BST (UK) »
there's a burial in Northallerton in January 1843 for a James Thompson aged 39
which would seem to match the death registration
James Thompson march qtr 1843 Northallerton vol 24 pg 291
Baptisms for Northallerton aren't on the online IGI for the period you need. The parish records are in the record office in Northallerton and I'm pretty sure it's one of the parishes they have really good indexes for.
http://www.northyorks.gov.uk/index.aspx?articleid=3134
Cornwall: Allen, Bevan, Bosisto, Carnpezzack, Donithorn, Huddy, James, Retallack, Russell, Vincent, Yeoman
Cards: Thomas (Llanbadarn Fawr)
Glam: Bowler, Cram, Galloway, James, Thomas, Watkins
Lincs: Coupland, Cram
Mon: Cram, Gwyn, John, Philpot, Smart, Watkins
Pembs: Edwards (St. Dogmael's)
Yorks: Airey, Bowler, Elliott, Hare, Hewitt, Kellett, Kemp, Stephenson, Tebb