Thank you Viv for your contribution,
As it happens, Priscilla Charlotte b.abt1828 became a great-grandmother of mine so I have looked particularly for traces of her and her parents but less (so far) for her siblings. I have no doubt that her mother was Priscilla PARTRIDGE b.17May1807 at Elsing, daughter of Mark PARTRIDGE and Charlotte RUDD.
At 31Mar1828 christening (Yarmouth, St Nicholas) the infant was recorded as Priscilla Charlotte Baxfield PARTRIDGE and her father as Mark PARTRIDGE. I believe this to be inaccurate and that the Mark PARTRIDGE present at the baptism was the father of Priscilla b1807. Whether by accident or design this avoided the stigma of bb annotation for 'base born' in the baptismal register but in the conventions of the time the given name Baxfield may imply the real father's surname and I have no doubt that Priscilla b.1807 was then unmarried. Whilst normally such inaccuracy in parish records would have been impossible, St Nicholas was a busy church with 57 baptisms during that month and seven on that day alone so the Partridges may have got away with it - or perhaps the implications later became too much to bear and they moved over the river to the next parish.
As previously indicated, Priscilla b.1807 wed a Henry BAXFIELD at Gorleston in Oct 1828. I would add that in census entries Priscilla b.abt1828 is recorded as a Baxfield and at her 1857 marriage her name was recited as Priscilla Charlotte Partridge BAXFIELD.
my working hypothesis is that the natural father of Priscilla b.abt1828 was Henry Baxfield. Clearly there are other possibilities but on the balance of available circumstantial evidence this seems probable.
As to Henry BAXFIELD's history - more research required!