The Rev Thomas Bowman, the Vicar of Martham on his retirement in 1791 published a book called Caustoniana: or Twelve Discourses addressed to the inhabitants of the parish of Cawston which is not a easy read.
Rev Bowman set up a mission in Cawston during the time of the Rev Leonard Addison and after his death in 1772 his successor the Rev Richard Baker, he felt a call to rescue the people of Cawston from what he regarded as their deplorable state, although his own parish was only about twenty miles away at Martham, in 1766 he established a congregation at Cawston and ministered to its members continuously for about a quarter of a century, he died in 1782 a after the publication of his book.
For more information/reading see books:
Within These Ancient Walls by Susie Timms.
Thomas Bowman Vicar of Martham: evangelist and composer by Michael Talbot.
Forty Norfolk Essays by R.W. Ketton Cremer.