Thanks, Steve, I would say that word of mouth had left confusion and that what you found is correct even though your findings have an extra letter in
Fairnington. Only today, I suddenly realized Belford was in England! May 13 1833 was a Monday. The minister wrote the letter on a Tuesday. I have wrestled with this for several weeks and you solved it in minutes!!
Jan

My grandmother wrote the following about her grandfather:
In May 1832, Jas. Gray was married on a Wednesday to Isabel McFarland.
But
a letter dated at Belford on May 14, 1833, shows the marriage year to be 1833 and the bride's name to be Fairington. James had a note written by his minister: This is to certify that James Gray, gardener, and Isabella Fairington, his wife, at this date leave the United Associate Congregation here, in full communion with the United Secession Church. It is signed John Hunter, Belford, Tuesday, May 14, 1833.