"Some records of Matson in the County of Gloucester and of the Selwyns" by Rev. William Bazeley, Vol.2, Page 241, 1878
Available online from the Transaction of the Bristol and Gloucester Archaeological Society

Pedigree of Selwyn formerly of Matson, Gloucester updated by Richard C Selwyn Sharpe and Mary G Sharpe

All sorts of bits and pieces collected by various members of the Selwyn family over many years.