Some questions have fallen away since the first census in 1911, while others have been introduced. But no matter where you are, you must fill it in – or pay a whopping fine.

Census field officers will be out to ensure this vulnerable cohort don't miss out.

Some questions have fallen away since the first census in 1911, while others have been introduced. But no matter where you are, you must fill it in – or pay a whopping fine.