Re: sovereign governments
IANAL, but things aren't so black and white. In most modern democracies (for the sake of argument, I will make the bold assumption that the UK system is one), there are some safeguards to ensure that people aren't totally spoiled. New laws can't generally have retroactive effect, and the government should compensate you if they decide that your house needs to be put down to make way for a hyperspatial express route.
That said, once again, I doubt that the right to watch online smut anonymously is such a fundamental right that you'd be compensated for the loss of your subscription.