As an ex LATCC and LTCC assistant, i was disappointed with the programme, the inaccuracies were woeful, and it seemed a classic example of a little bit of knowledge being a dangerous thing. The producers had got into their heads that the EGLL go-around procedure is an accident waiting to happen, and then gone off the deep end from there.
I do believe that a mid air is going to happen somewhere over the London TMA, sometime in the next few years...the airspace is getting very crowded, and sooner or later 2 bits of aluminium will try to occupy the same bit of sky at the same time. For every ATCO saying "load of cobblers, it will never happen", there must have been more than a few saying " there but for the grace of god...."
I just hope that I'm not on duty when it does...