Doesn't help with finding a marriage of William and Ann, however to possibly help locate him in some other records, William seems to have been a mason. I notice there is a baptism on 4 Sept 1771 at Alconbury-cum-Weston for a Charles GOODWIN, son of William and Ann. He seems to buried 19 May 1778, son of William GOODWIN, a mason. (on FreeReg, bishop's transcript)