http://www.achurchnearyou.com/clapham-st-john-the-evangelist/
Website with information about architect, year of creation, neo classical etc.

http://www.christchurchstjohn.com/what.html
community projects info, whats on.

Collins - Churches - Timothy Brittain Catlin
( book that shows type of churches in london)

http://www.ukattraction.com/london/st-john-the-evangelist-clapham.htm