For UK and England and Wales:
Office for National Statistics (ONS)
Census Customer Services:
Tel: +44 (0)1329 444972 (Phone)
9am to 4pm Monday to Friday
Tel: +44 (0)1633 652981 (Fax)
Email: census.customerservices@ons.gov.uk
Postal address: Room 4300S, ONS, Segensworth Road, Titchfield, Hampshire, PO15 5RR
Websites:
2011 Census homepage, England and Wales
For Northern Ireland:
Northern Ireland Statistics and Research Agency (NISRA)
Tel: 028 9034 8160
Email: census.nisra@dfpni.gov.uk
Website: www.nisranew.nisra.gov.uk/census
For Scotland:
National Records of Scotland (NRS)
Tel: 0131 314 4254
Email: customer@gro-scotland.gsi.gov.uk
Website: www.gro-scotland.gov.uk/census