The source of the Special Workplace Statistics (SWS) is the part of the census form that asks respondents to provide the address and postcode of their place of work, the type of work they do, the nature of their employer's activity, and the dominant mode of transport they use while travelling to work.
More information on interaction data and access to the data set can be found at the Census Interaction Data Service (CIDS). [Note: This link opens in a new window]