As you are aware, Census day is March 21.
But this weekend the national campaign launches (Friday, February 12), followed by all households receiving notification of the census towards the end of February.
Households will then receive their Census Unique Access Code in the first week of March. 
When households receive their access code, they can immediately complete their questionnaire online. Paper questionnaires can be requested - though some households (for example: in digitally deficient areas or where householders have been noted as elderly) will automatically receive a paper questionnaire.
Due to lockdown, there will be many people who want to support friends, families or individuals who are isolated or shielding in their communities. There is a Census Support Line which will be fully operational through and beyond March. However, should a 'trusted friend or carer' want to support an individual that is possible too

Census Timeline

Guidance for Carers