According to a recently published article on Arstechnica a man was arrested in Cardiff, Wales (UK) and charged for training people how to use encryption:
Now, I think it would be easy to get the outrage bus out from its garage and heading to Westminster with pitchforks at the ready; but logically, this is the same as someone being charged with planning to use a rolling pin as a weapon to commit murder with.
The crime isn't knowing how to use a tool or educating other people on how to use it, rather the crime is the planning to commit an act of terrorism and the tool is just part of the execution.
In that sense there's nothing to see here and we can leave the outrage behind...
However, Theresa May when Home Secretary was one of the driving forces behind what was known as the Snoopers Charter in 2012 and in 2015 criticized the Liberal Democrats who blocked it in parliament.
At the moment the Investigatory Powers Bill is going through the Lords and will most likely be enacted. This doesn't affect personal encryption as far as I am aware but should make it easier for the security services to access data when conducting and investigation - it also includes the retention of ISP records etc to help prove what devices were used for Internet communication. I believe some bits of this were in the failed 2012 bill. My bet is that once this one is through, a new bill will be tabled next year that will again attempt to either force back doors into commonly encrypted communications or set out terms as to who/what can freely use encryption that does not have back doors.
I guess we'll have to wait and see, in the mean time, if you are planning something very naughty in the UK, it's probably best to stay away from encryption as it looks like that will help confirm your guilt intent - a bit like wandering around in public with a balaclava and baseball bat :-P