The Conservatives are called the Nasty Party for a reason. They always have some ultra-conservative and establishment lazy, police and security need-more-powers bill in mind.
Ethereum's ambitions to be disruptive are well beyond what simple currencies and assets are looking for, so in the event such stupidity took place in the UK, they wouldn't be unaffected. That said, it would take a lot more than just the UK taking such actions to be a large problem. The UK doesn't rule the waves anymore.
Also, it would be extremely clumsy relative to any ambitions they have for the UK to play host to new digital finance. I'm not suggesting they aren't that stupid but it seems unlikely anything more will happen with this soon - we have an election in May2015 and there will be alsorts of FUD and blunder in the media until then.
I'd worry more that everything is still tied to Bitcoin and if miners are struggling with the price to the point they are selling, then that is an indication of real stress. Perhaps in this space certain products do not evolve but they die.. what can be done to help adopt old BTC users?