I agree Yammy.
Calistemon, given the questions asked on the last census we completed, would you really want all and sundry to have access to it in 10 years? I wouldn't and I don't think I have anything to hide, but some people probably wouldn't have been truthful, for instance about their sexuality, if they knew the information would be seen by others so soon. However there really wasn't anything in the 1921 census that you couldn't discover elsewhere other than occupation and number of rooms inhabited, unlike earlier censuses which demanded to know how long you had been married and how many children had been born to the marriage, still alive or by then dead, which must have been distressing.
I do agree that ppv is unfair though as it puts research beyond the pockets of so many. Unfortunately the Scots site ScotlandsPeople is the same, though the Scottish 1921 census hasn't been released yet.