Hello
There is one Stephen Browne baptised at Harefield
Stephen bapt 10.2.1771 s of Susanna Brown and natural fathe John Wenman.
Susanna was a local girl daughter of Joseph and Susanna Brown bapt 18.5.1752.
Her siblings
William 5.2.1750,Elizabeth 3.8.1755,Sarah 12.11.1758 ,Joseph 19.4.1761,Mary 6.11.1763,Charlotte 26.1.1766 and Maria 22.5.1768.
Her father Joseph was bapt 16.2.1724 s of Joseph and Elizabeth Browne.He married Susanna Sheward by licence 29.5.1750.
His sister Ann bapt 31.12.1722 married John Wenman in 21.12.1758 .(Both signed)She was buried 11.12.1775.
So it looks like susanna and John were related by marriage.
Susanna Senior or junior married John Abbott 28.4.1771 at Harefield .Unhelpfully no marriage status given.
I know Stephen's age is a bit out but perhaps he lied when he signed up and it's not miles out.
Ciderdrinker