I hope this helps
They were not George and Jane of Ashington because their son William born 1776/77 was buried aged about 6 months
Ashingtom Parish Register
Ashington SS Peter & Paul
William PENFOLD Baptised 22 Feb 1777
Father George PENFOLD Mother Jane PENFOLD
Ashington SS Peter & Paul
William PENFOLD BURIAL DATE 24-Jun 1777
son of George & Jane
The sister Katherine born 1770 died in 1843 in Thakeham Sussex married to Thomas Payne