Piper
www.documedia.co.uk
[email protected]
37 Windsor St.
Cheltenham,
GLOS
GL52 2DG...........if they have not moved
R/T very subjective from airfield to airfield.
Some will give clearance on Grnd delivery freq, some on grnd and if it is just a zone clearance, you may get it from Twr.
Our chaps, NATS, will always respond to request for an R/T check.
Personally, if you have two boxes, use one and you will find out how it's performing and before you get airborne, try the other box too.