Almost impossibly bad. It's as though they gave an idea to a bunch of GCSE English students and said "go and write the script now" because the dialogue is woeful. Some terrible casting - Alexandra Roach, for instance, is dreafully unconvincing as a cyber security chief - and you can see the soulless eyes of Sharon Small and David Threlfall as they openly wonder "how did I stumble onto this car-wreck of a show"? Wasn't even curious to start the second episode.