Originally Posted by Farmer 1
QFE: It is used only close to an airfield, not for en-route navigation. To do that would be dangerous.
Any chance you can pass that pearl of wisdom onto a certain military unit (one of only two with their particular type of airspace) who insist on handing over
transit traffic, outside their CTR, on the QFE
RPS: If you are flying across country, away from other airfields, remaining below the transition altitude, what other pressure are you going to use?
Working on the basis that a) the UK is not a large country (if the pressure difference is that big you wouldn't be flying); and b) you're going to have to call an ATC unit for that regional pressure; then why not dial up a nearby ATIS and use that airports QNH? Might also have the added benefit of not busting CAS when the lower level is defined as an Altitude. (RPS in this situation having the effect of putting you inside CAS when you think you're outside).
Just an idea - might be worth considering