there is no suggestion that Blair or his group made a proposal for "questioning" or "doubting" to be offences. Have a look at the first post on this thread. It is a lie, probably intended to stir up argument.
In Germany and Austria Holocaust Denial is an offence, as is the display of Swastikas. They used to have a lot of committed Nazis to keep under control. Many of them have changed their minds and/or pegged out by now.
There is a fellow called David Irvine who made an unsuccessful libel claim after a book described him as a Holocaust denier, falsifier, and bigot, and said that he manipulated and distorted real documents.
The English court found that Irving was an active Holocaust denier, antisemite, and racist, who "for his own ideological reasons persistently and deliberately misrepresented and manipulated historical evidence". In addition, the court found that Irving's books had distorted the history of Adolf Hitler's role in the Holocaust in order to depict Hitler in a favourable light
see
http://en.wikipedia.org/wiki/David_Irving
It is not a crime in the UK, but he repeated his claims in other countries, including Germany where he addressed neo-Nazi rallies and was eventually expelled. He was also prosecuted and imprisoned in Austria. During his trial he claimed to have learned that he was wrong and to have changed his mind. He has been banned from entering many countries, including Canada and Austria. He is something of a serial litigator.
We can accurately and safely describe him as an active Holocaust denier, antisemite, and racist.
He has written a number of books which are popular among neo-Nazis and antisemites. Some of Mr Irving's views seem to have cropped up recently on DIYnot. I am sure that he had access to all the "evidence" and opinions available to Joe. They have been thoroughly examined and dismissed.