> it would depend on how you define extremism

I don't need to, the government already has widened the definition to include white supremacists and has a list of proscribed groups. This allows Prevent (the de-radicalisation programme that was originally set-up for Islamist terrorists and potential terrorists) to work on de-radicalising white supremacists too and for MI5 to focus some of its energy on preventing extremism and violence in the UK.

> However there are plenty of fundamentalist/extremist views within the UK which exist regardless of what the right wing does.

I am certainly not saying "right wing bad". I'm saying "far-right white supremacy bad". And probably "far-right bad" in general, just like I'd say "far-left bad". Extremism, in general, requires you to move away from compromise. Whether it's far-left or far-right, in my judgement it will always lead to conflict.