2 children baptised in Darlington St. Cuthbert suspiciously look like your couple:
Jane Feetham born 20 Sept 1808, baptised 11 Oct 1808 1st daur of Thomas Feetham, labourer, native of Eryholme Yorkshire by his wife Mary Hand, native of the Parish of St. Helen Auckland
William Feetham born 6 June 1812, baptised 26 June 1812, 1st son of Thomas Feetham, labourer, native of Eryholme Yorkshire by his wife Mary Hand, native of Evenwood in the parish of St Helen Auckland
Janis