Raggy, your case is that the census and independent polls are all wrong.
Fine.
I, like the government, industry and commerce regard them as strong evidence.
You have no evidence at all.

Dave, I can see why a believer would not lay bare his beliefs to someone who thinks such people are all deluded fools.
I do not see why they would lie on a census return or a survey.
I am sure some do but not significant numbers I think.

Certainly the Office For National Statistics stand by the findings, as is reported in the article Musket linked to.