I have a bit on his brother William in Rosser chap 7
see http://www.ee.surrey.ac.uk/Contrib/manx/methdism/rosser/ch07.htm
(there are still many scanning errors to be corrected in this chap)
William came from Kirk Andreas - there is a brief paragraph re Charles
I also have re William Rev. William Radcliffe whose biography given in the Methodist Magazine for April 1838 (he was born in 1775), states that his parents were among the first Methodists in this part of the Island[Kerrowgarrow]. A Society Class met in their house for many years