Records on
http://www.wolverhamptonhistory.org.uk/resources/indexes, Ancestry and Freereg
There were two marriages for a Matthew Fletcher at St. Peter's, Wolverhampton
Matthew FLETCHER to Mary PITT Marriage 22 May 1725
Matthew FLETCHER to Sarah MOSLEY Marriage 03 Nov 1728
Sadly the following baptisms only mention the father and not all on the same site.
Joseph Fletcher 19 Oct 1729 St. Peter's, Wolverhampton
Thomas Fletcher 18 Sep 1736 St. Peter's, Wolverhampton
FLETCHER Martha daughter of Matthew 7 Jun 1731, FLETCHER John son of Matthew 3 Mar 1733, FLETCHER Margaret daughter of Matthew 13 Oct 1734, FLETCHER Sarah daughter of Matthew 2 Sep 1738, FLETCHER Susannah daughter of Matthew 1 Dec 1747,
William FLETCHER Baptism 3 Jul 1740 Staffordshire Wolverhampton : St Peter Father Matthew
Matthew FLETCHER Baptism 4 Jan 1747 Staffordshire Wolverhampton: St Peter Father Matthew
Burials.
FLETCHER Matthew 15 Feb 1758 FLETCHER Matthew son of Matthew 19 Jun 1746, FLETCHER Sarah wife of Matthew 9 Jun 1752
So I wonder if William 1740 is the one you seek and is Matthew 1747 uncle of John and witness at his marriage?
Colin