Sandy, The marriage was registered 1860 in the Brixworth registration district which it seems covers a large area, So perhaps they married elsewhere, where they were less well known as they already had a child out of wedlock?
John Crier was a shoemaker before turning his hand to farming. so those bapts. are the right family.
The John & Hannah one is not one of my lot as far as I know?
I think the last child to be baptised to John and Sarah in Northants was Emma 1866 the next child Alfred 1868 was bapt. in London. I have trawled the 1871 census manually but cant find them in London, but they were there.
Christened in Northants:-
Agnes b1860
Charles William b1861
John Edward b1863
Mary Ann b1864
Sarah Ann b1864 (uncertain.)
Emma 1866
The poor women had 14 children.
Thanks for the Bapt. details, Nigel