Re: No is the answer and it remains that way
making secure crypto that is only breakable for lawful law enforcement is just as easy as staying in EU and exiting the EU at the same time. May does that flawlessly, so obviously that crypto stuff is just as flawless
Actually, it is easy to think of several half-way credible ways of doing that. I mean the crypto breakable by good guys only, not the Schrödinger's Brexit. And politicians, aided by some intellectually dishonest experts, may well latch on one of those and make it mandatory.