Redroger,
Right, it's been difficult getting back on our (shared) laptop, but here are all the AYRES/AYERS entries I found in those Nonconformist Registers. It may be that none of them pertain to your family, but at least by putting them on here, they can be looked at by anyone with an interest in the family in Cambs...
So, at Cambridge Castle Street Methodist (passed it on my way up to the CCRO today!):
A baptism on 09-12-1877 for Ernest Alfred AYRES son of Geo William and Louise of 16, Newmarket Rd., Cambridge, grocer.
At the Ely Wesleyan:
Baptism on 08-06-1847: William AYRES son of Ralph and Ann of Oxlode Downham. Born 30-04-1847
Then an amazing eight-fold baptism of the children of Matthew and Elizabeth AYRES of Dairy Houses, Littleport on 18-06-1849.
Sarah Ann born 26-06-1834
Matilda born 18-09-1835
Matthew born 01-12-1836
William born 15-08-1838
Joseph born 24-04-1841
James born 14-12-1841 (?)
Abraham born 24-09-1843
Elizabeth Ann born 05-10-1848
Might this have been some kind of family baptismal world record...!
Then on 18-02-1850: Baptism of Mary Ann (born 19-01-1850) d. of Matthew and Elizabeth Ayres
30-09-1862: Baptism of Ruth Ann, born 24-09-1858 ditto parents
22-10-1871: Baptism of Annie, born 20-12-1862. ditto parents
All these last at Ely Wesleyan. Will post Ely Primitive Methodists, and Wisbech Ely Place after a sip of wine...
keith