slip and turn
What are you on about? That reference is about selection of Vertical Speed - and it is a bloody good practice in busy airspace not to select a high climb/descent speed as TCAS picks it up as a prospective target, regardless of the level that you have assigned, and could cause an RA - which in the LTMA certainly ain't much appreciated.
And for the chap who posted about challenging safety, I absolutely agree with you. Nats and their controllers should not be afraid of challenge - and they are not. But let's do it through the right channels, not by running with hysterical stories to a broadcasting corporation who love kicking Nats anyway (yes you do) and accuse your former colleagues of "errant" practice.
P7