Had a look on IGI. Not sure if this is the same family but coincidence of names and around same timescale but not same area of the country! This si the only family on IGI with these anmes.
William Pemberton Edwards of Oswestry, Shropshire b abt 1771 m Sarah Lewis of Hordley, Shropshire b abt 1775 marriage 17 April 1796 Hordley, Shropshire
Children Thomas Pemberton Edwards b 11 Jan 1797 St Aspers, Shropshire Christening 24 Apr 1797
William Edwards b 24 May 1798 St Aspers, Shropshire Christening 31 May 1798
Mary Edwards b 23 May 1800 St Aspers, Shropshire Christening 27 Jun 1800
Sarah Edwards b 19 Jun 1803 St Aspers, Shropshire Christening 26 Jun 1803
Robert Edwards b 22 Aug 1805 St Aspers Christening 22 Sep 1806
Elizabeth Edwards b 8 Feb 1809 St Aspers, Shropshire Christening 26 Feb 1809
Thank you Claudia for looking. However they are not the family I am after My William and Sarah definitely married in 1799.I have seen the marriage entry with my own beedy eyes in the PR.