https://infuse.ukdataservice.ac.uk/index.html
InFuse - access 2011 and 2001 UK Census data
2001 uk censusinfuseaccess2011data
https://www.data.gov.uk/dataset/1c1b4af7-7446-4250-95f0-9020fb865f4a/2001-census--data-and-workings-to-produce-travel-to-work-areas
2001 Census - Data and workings to produce Travel to Work areas - data.gov.uk
2001 census