Hi Amanda
Sorry, are you saying Crissany is a Macklin/McClean? I've not come across her before, in any event.
I'm aware of James Macklin, son of Samuel and Susan Macklin (late Whitfield) as having been baptised at Sandy in 1810, but I think Susan then died and Samuel remarried to Theodosia Harding at Great Paxton (fairly nearby) in 1811, with their first child, William, baptised at Great Paxton in 1812.
I've also got it that William Welch married Sophia Macklin, daughter of Charles Macklin and Sophia (late Hane) on 5 Dec 1827 at Baldock, Herts (again, not very far away). That's my only Welch reference so far.
Shane