Good find, I think the marriage licence nails the Forrester/Foster surname argument.
Looking for a potential north staffs baptism for John Forrester of Launders Bank, one possibility is the baptism at Stoke, parents William and Mary.
This was on the 27 Nov 1731. I couldn't see any other baptisms with parents William and Mary but maybe not looked into this enough or at burials for either parent.
John and Mary Lightwood's first child is also called William, a suggestion possibly that a William Forrester may be his father ?
On the 21 Nov another John Forrester is baptised at Stoke, parents John and Mary. It looks like this John may have been buried in 1740 "John son of John Forrester of Bucknall". Other children of John and Mary baptised at St Peters, Stoke - Isabella 1733 of Bagnall, Thomas 1735 of Bucknall, William 1736 of Bucknall, Thomas 1741 of Bucknall .
Burials of children of John Forrester- William 1737 of Bucknall, Ann 1740 of Bucknall, another William 1740 of Bucknall.
Both John Forresters baptised within the same week, could William and John be brothers possibly?
This at least appears to be an interesting connection with the Bucknall/Bagnall area in the 1730's to consider.