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It inevitably cannot be the correct decision if the standards are not applied across the board which they haven’t in recent years.

The issue isn’t that Gary has tweeted criticism of a government policy, which he and others have done in the past without repercussion. The issue is that he thought it acceptable to compare the policy of a mainstream political party (a policy which a not unsubstantial proportion of the country support) to the behaviour of the nazis.
Unless you can give examples of others who have compared the behaviour of a mainstream political party to the Nazis or other similar groups (Isis, North Korea) and not been reprimanded it is not factual to say the standards are not being applied equally.
It really isn’t unreasonable to have standards that allow people to disagree with things politely but don’t allow such criticism to turn into insults or hyperbole.

The BBC cites the fact that he was not impartial, not the content of his tweet.

He also, at no point, compared government policy to anything done by the Nazis. He said the language used is almost comparable and that I’m afraid is a true and has been subject to criticism by many other media figures.