J.I.M. Stewart 
Naylors [PDF ebook] 

George Naylor, an Anglican priest, has doubts about his faith. He goes to stay with his brother’s family, who unfortunately regard religion with some disdain and George as a bit of a joke. Enter Father Potter, sent by the establishment to regain their wayward cleric. There then occurs a series of adventures including the discovery of a secret research laboratory which is conducting testing on animals, and the prospect of George and Father Potter being involved in a protest rally which includes nuclear disarmers and anti-vivisectionists. All is brought to a hilarious conclusion in this fine example of Stewart’s witty writing.