Mr Sane,
it was the phrasing that raised peoples hackles...
NATS has an extremely good safety record - and it's not as if ATCOs wake up one morning and think.. "I've not had an incident for a while, I think I will have one today", the phrase 'not be tolerated' infers that we do not care if we have an incident - it's complete tosh and is a prime example of how some management workers have absolutely no idea what air traffic control (NATS primary business), is about.
And thats what is worrying!!