Hi
That makes it 99.99% as Sophia had a brother Mathew who married Mercy Appleton in 1820, so my guess is that the other witness is in fact Mercy not Mary, The same pair were witness to another brother John's marriage in 1826.
That seems only to leave the marriage of Sophia and Mr Read to be discovered and the death of Mr Read, I take it neither of these events feature in the KFHS transcript of Northbourne PR ?
Was the marriage of Sophia & William by Banns or License ?
Many thanks for your help on a loose end that I had almost given up on !
Regards Max