Just doing a little more searching on that, and found that John Roberts & Frances Hopley baptised 4 children in Liverpool between 1802 & 1811 (and possibly later, but no maiden name listed on others). As I have Neston listed as the birthplace of 4 children of my couple in 1804, 1809, 1812 & 1815 (the last being listed in the church records, the others from census returns), it seems unlikely that mine are from the Roberts/Hopley marriage.
Impy