an anodyne biography appeared in A W Moore's Manx Worthies
(see http://www.ee.surrey.ac.uk/Contrib/manx/fulltext/worthies/p087a.htm)
A paper by Ann Harrison appeared some 20 years ago in Proc IoM Nat Hist and Antiquarian soc
A. Harrison Richard Sherwood in Manx Politics Proc IoMNH&ASoc viii #4 pp349/361 1982
presumeably written before the MM acquired the letters