At the present time there is no online source for the census form used in the 2019 Rehearsal

Nor is there an online source for the census forms actually used in the 2021 England & Wales census

But you can download drafts published in 2020 from this page on the Office for National Statistics website.

IMPORTANT: this is NOT an official government website.

For more information about the 2021 Census and earlier censuses see the LostCousins newsletter, the latest issue of which can be found here.