Do William and Elizabeth get married in Sherrif Hutton, then the tailoring work dries up in Yorkshire, so they decide to go to London. Ann is born in transit at Arnold, but no time to get her baptised there, they've got a canal boat to catch in Northants, so they get her baptised at Bugbrooke?
Found another baptism in St Sepuchre, William George in 1819, father is a tailor again