UK Vortex Rules

[30W]

I remember some years back now NATS split the medium into upper/lower.

I can't recall the details, can someone provide them for me?

Many thanks

30W

[reportyourlevel]

CAP 493 Manual of Air Traffic Services Part 1 SI 04/2009: http://www.caa.co.uk/docs/33/cap493supplementaryinstruction200904issue04.pdf

[30W]

Many thanks!