http://www.1911census.org.uk/1921.htm
snip
The stated government position from the ONS is "its intention to release the entirety of the 1921 census returns in 2022, in accordance with the non-statutory '100 year rule' which was adopted to reflect this undertaking of confidentiality".
The relevant part in the above quote is non-statutory, that means it does not have the authority of law (statute).
In other words the present 100 year rule is simply a nice comfortable rule unlike the previous 100 year rule that was introduced under a statutory power ( Statutory Instrument No. 12 of 1966 ).
The 1920 Census Act puts no time limit on the period of non-disclosure of personal information from the census.
http://www.rootschat.com/links/0wkf/The Census (Confidentiality) Act 1991, which amends the 1920 Census Act, makes it an offence for the Registrar General or any person under his/her control or who supplies services to them to disclose and personal census information.
http://www.legislation.gov.uk/ukpga/1991/6/introductionAgain no time limit is placed on the non-disclosure clause.
It has been recommended by the Advisory Council on Public Records and Archives that the closure period on census be 80 years.
I would be happy with that what I am not happy with is that the census be closed forever.
In my view it is up to the government to set a closure period on census.
If they decide that the closure period should be 100 years then that would be acceptable though as I have said I would prefer 80 years.
Cheers
Guy
P.S. There is a hope that the Statistics Board may release census information early. However there is doubt whether they actually have the power to do so as their mandate stems from powers in the 1920 Census Act given to the Registrar General.
Those powers were however taken away from the Registrar General by the Freedom of Information Act 2000.
The whole thing is a mess.
Guy