They employ 17,000 field staff as part of the census: https://census.gov.uk/jobs/ https://census.gov.uk/jobs/ > Cost of running a few trial runs of one 10,000

They employ 17,000 field staff as part of the census: https://census.gov.uk/jobs/ https://census.gov.uk/jobs/ > Cost of running a few trial runs of one 10,000 house town or city to perfect the process: £100k The census trial ran in four local authority areas each with populations in the hundreds of thousands.