So disappointing. Great actors (and a good idea for a story) but equally some who were just so wooden. The "work experience" plot line is as ridiculous as everyone said above, but the disaster was the conclusion. As said earlier, it rivalled Game of Thrones for the rush to finish the episode, with no real conclusion. With two minutes to go it all seemed hopeless, indeed it still did, despite the claimed salvation.
So much nonsense. Bury the man you have just murdered and impersonated in his own back garden. Walk through a riot waving your GCHQ credentials.
It did have some good bits in it. Just like Game of Thrones. But do not expect much from Episode 6 if you do get there.