Oh wow, Lucy, thank you so very, very much!

And, nope, he never married her, the cad

Martha was my 4x Gt Grandmother, and she ended up marrying my 4x gt Grandfather, Thomas Cowdery in 1818 in Middlesex. [He is also a bit of a mystery as he inconsiderately died just prior to the 1851 census, he has now been my brickwall for 9years, so do let me know if you ever stumble across a baptism for him around 1790 lol]
I really appreciate your time in looking up Eliza's baptism and am so pleased I now have an abode for William. Wonder if he was already married
Again many thanks