The Office for National Statistics (ONS) is researching the design of the 2021 Census, in relation to long-term health problem or disability question. They have opened a survey for data users.
The survey closes on 3 August 2018.
The ONS are considering changing the question used in the 2011 Census to one based on the Government Statistical Service Harmonised Principle on classification of disability in terms of the Equality Act 2010.
The Harmonised Principle is designed to measure the core population of currently disabled people for the Equality Act 2010. It was not developed in time for the 2011 Census. Moving to this question in the 2021 Census would mean a loss of continuity with the data previously collected in the census.