General   (General discussion, talk about anything.)

The information you provide needs to be about who usually
lives in the household on Census Day, which is Sunday
21 March 2021. You can submit your questionnaire on
Census Day or as soon as possible after. If you need to, you
can complete your questionnaire before 21 March. If your
household circumstances change on Census Day, you can
let the ONS know


From here

As usual Tonker is making things up and posting them as facts.