The frustrating piece is that they're ignoring their own internal experts on this. The people running the National Cyber Security Centre are very bright and have stated that they think backdoors are a bad idea
from http://www.newstatesman.com/politics/uk/2017/05/problems-end...
"Ian Levy, the technical director of the National Cyber Security, told the New Statesman's Will Dunn earlier this year: "Nobody in this organisation or our parent organisation will ever ask for a 'back door' in a large-scale encryption system, because it's dumb." "