Back in 1986, Brian Innes, a reporter for the magazine "The Unexplained", unearthed this strange tale from the Isle of Wight. Living here at the time I made my own enquiries and contacted the Rev. James Evans and he confirmed the salient points of the tale. However, I must stress that to date, some 15 years later, the manuscript referred to by the Rev. Samuel Trelawney as having been found in 1866 has still not been located.
1. Sources: http://www.insula.vecta.btinternet.co.uk