Bobbisox
You know what? I absolutely don't know whether the punishment fits the crime. You know the running debate on free speech? I've always been offended by what comes out of some right wing parties and parts of the right wing press, but never once thought, "I find that offensive, therefore they should be brought to court".
For the record I find their stance offensive and fundamentally devisive. They are a stain the name of Islam and holding up those banners outside the court actually increases hatred for Muslims generally.
If rank stupidity was a crime, then they would be doing a twelve stretch.
But leaving that aside - the crime that they were convicted of is actually quite minor. It was using language likely to cause public offence, I believe.
Had they used racist language, the sentencing guidelines would've seen them fined a much higher amount.
So to answer your question - the sentences are actually probably right legally, but in terms of the amount of offence actually caused - probably not.
Minefield.