« Reply #5 on: Saturday 19 November 11 23:18 GMT (UK) »
perhaps sight of the parish marriage entry may help if a relative is a witness. You can get a copy from the record office in Truro
http://www.cornwall.gov.uk/default.aspx?page=14713or if you are near an LDS centre, you can order a copy of the film of the register to check.
As their daughter was baptised in a methodist church, it's possible that there isn't a parish baptism for James.
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