British Religion In Numbers reports on 2011 Census Detailed Characteristics for England and Wales:
On 16 May 2013 the Office for National Statistics (ONS) published the first outputs from the third wave of results (Release 3.1) from the 2011 census of population of England and Wales. They comprised detailed characteristics for local authorities in terms of cross tabulations for the questions on ethnicity, national identity, country of birth, main language, proficiency in English, religion, provision of unpaid care, and health. The full tables can be consulted at: https://www.nomisweb.co.uk/census/2011/detailed_characteristics
The BRIN article linked above contains a helpful summary.
There is a Statistical Bulletin here, and there is a shorter paper: What does the Census tell us about religion in 2011?
And David Voas has published Religious Census 2011 – What happened to the Christians? (Part II)
The Census detailed characteristics on religion for Northern Ireland were also published on 16 May and can be viewed here.
There is a press release: Census 2011: Detailed Characteristics for Northern Ireland on Health, Religion and National Identity and a Media briefing.