Help finding a marriage please

[Merry]

I am looking for the first marriage of Mary Gildart and/or the baptism of her child with him. Here's (probably too much of) what I know already:

Mary Gildart was born about 1730-1738 in an unknown place. Her parents were John Gildart and Elizabeth. From about 1738 she and her siblings were brought up at Alrewas Staffs.

She is mentioned in the 1785 PCC will of her uncle Francis Gildart as Mary Morewood the wife of the Rev John Morewood of Highfield nr Chesterfield, Derbyshire.

I found the marriage of this couple:

12 Dec 1772 St Mary's Islington The Rev John Morewood of Eyam, Derbyshire and Mary Scammell widow otp, by licence. Witnesses Mary Morewood and John Hetherington. Marriage conducted by John Fawcett, curate of Chiswick.

Mary died 1809 at West Hallam Derbyshire and her husband in 1828 at the same place. As far as I know there were no children from this marriage.

However, I know there was at least one child born to Mary from the marriage to Mr Scammell. I don't know when or where this child was born, but her name was Ann Scammell.

Ann Scammell married the Rev John Fawcett b abt 1743 (probably the man who conducted the above marriage!) 16 Sept 1788 at St Mary's Chesterfield, Derbyshire. John was of Milford Hants and John Morewood (Ann's step-father) was a witness to the marriage. John and Ann Fawcett lived at Milford (he had the living there from 1786) where she had three children, the last named Gildart Fawcett. John Fawcett died abroad (West Indies??) in 1795 (can't re-find that at the moment - Gentleman's Magazine?).

Ann was still alive in 1827 as she dealt with the estate of one of her children. She was living at Symondsbury Dorset, but I don't think she died there and after this I lose track of her, so I don't have her age at death which could have been helpful.

So, who was Mr Scammell?

(don't find it too quickly, as I've been looking for ages!! lol)