It has been suggested they were a a John & Mary who baptized their son William in 1786 in Birmingham.
How about a 1776 William bap. at aged 30 days to James and Mary Catherine CLINTON in Stepney.
The reality however could be from anywhere in the country, or elsewhere
Sources
WikiTree profile UnknownSurname-8 created through the import of HENDERSONLornaAncestorsPlus1Desc4WikiTree.ged on Oct 18, 2011 by L Henderson.
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DNA Connections
It may be possible to confirm family relationships with Mary by comparing test results with other carriers of her mitochondrial DNA.
However, there are no known mtDNA test-takers in her direct maternal line.
It is likely that these autosomal DNA test-takers will share some percentage of DNA with Mary: