Lancashire Parish Record Society Vol`143 Registers of St Michael's On Wyre and Copp Chapel has the following:
Copp Chapel Baptisms:
1832 May 9th Margaret d. Robert & Lucy Thompson of Great Eccleston - Schoolmaster
There's no record of a marriage for that couple at Copp Chapel, marriages there were very rare - it seems to have served as an annexe to St Michael's. I can't find a marriage for the couple at St Michael's either, however there are other baptism records from Copp Chapel which might be of interest:
1823 March 3 Margaret d. Robert & Lucy Thompson of Elswick, schoolmaster
1825 Feb 23 John s. Robert & Lucy Thompson of Elswick, schoolmaster
1827 July 29 William s. Robert & Lucy Thompson of Great Eccleston, schoolmaster
1830 Mar 10 Robert s. Robert & Lucy Thompson of Great Eccleston, schoolmaster
Hope that helps,
jds1949