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The easiest and most obvious safeguard is to make the UK a constitutionally secular state. That way, the Muslim fascists and the Catholic fascists and other religious groups can't foist their nonsense on the rest of us.
One agrees with Danjay I'm not sure how "easy" that is though but. How many times do you hear someone put the idea forward. The next thing you would hear is that you were stamping on someone's culture.