rolling jail sentences
If I ever decide to visit Ol' Blighty, then every device I have will have some variant of "fuck off copper" as the password.
They can go along and detain me, and then attempt to prosecute. In court, I will simply ask if they tried the term "fuck off copper" as the password.
I'm sure there are enough competent ambulance chasers in Blighty who would relish the chance of slapping the plod with an unlawful imprisonment suit, complete with a suitable large damages sum.