A balance must be struck
I'm sure that with modern technology we could design a society where it was virtually impossible to commit a crime without being caught. Such worlds have been considered many a time in fiction, and just think what some of the fascist regimes of the past could achieve with modern tech.
I presume this whitehall official will be volunteering to be the first to have the 24/7 monitored cameras installed in every room in his house?
There certainly are some horrible, nasty, exploitative people out there. Always have been and always will be. Some of them even work in government.
Get warrants, employ more people and treat everyone equally.
If the security services don't act within the law it makes them no better than the other criminals they are trying to catch.