On another side of the camp -- past the clothes stand selling T-shirts with holy slogans such as Gracebook and JC / DC ( Jesus Christ / Demon Crusher ) to trendy teenagers -- Nicholas Piercy , 39 , father of two , has just attended an afternoon seminar bythe Right Rev Michael Nazir-Ali , the soon-to-retire Bishop of Rochester , who stands on the evangelical wing of the Church of England and has often courted controversy with his comments about Islam .