It held my attention during the first two episodes but then there were so many ridiculous plotholes, (stole that - love it!) that it lost all credibility, in particular the total lack of security that led to the baddies repeatedly catching up with them.
Also, can a random baddie enter into Downing St with a fake press badge? Surely there is a pre-approved list of known journalists that are vetted in advance?
By the last episode it all got so silly that I was almost laughing.