Many thanks JenB -- ties in to nearby farms where the family were over the years.
The burial entry ended with the phrase 'aqua demersus' -- I have found an entry in the Newcastle Courant dated 12 May 1770 which explains 'Tuesday, as Mr John Readhead, of Garley, near Rothbury, was returning from Tosson races, in crossing a brook, he fell off his horse, and was drowned'
Possibly had a few drinks at the races with his friends??