Originally Posted by
250 kts
Oh yes it would! There are areas in the UK that even if we go 4 miles north of track on a radar heading it causes issues with other sectors and danger areas. Allowing you to go that distance on your own would be a no no.
There's routes in the South of the UK FIR that are 7 miles apart both in the same direction and opposite direction. The whole reason they're there is because of the accuracy of RNAV kit. If you all decide to fly your own offsets then we'll end up with a loss of separation very quickly. It's not really a feasible option anywhere in UK airspace, at least not without checking first.