Folks:
Osbournby is pronounced Osenby,
Aslackby is pronounced Aislaby,
and for good measure
Aswarby is pronounced Asaby.
As for Folkingham, which used to be spelt Falkingham, it's usually pronounced Fockingham.
I live in South Lincolnshire, and it's a minefield for the unwary!
David.
PS: Stroxton is pronounced Strawson, and Croxton is pronounced Crowston