Church House communications division are bringing these regularly before people - lots of interesting stats culled from Lynda Barley's work. For example:
Key facts about the Church of England: Church attendance and visits
The Church of England has the largest following of any denomination or faith in Britain today. Almost half the people in England regard themselves as belonging to the Church of England, while 7 in 10 consider themselves Christian.
More key facts about the Church of England today can be found at: http://www.cofe.anglican.org/