Don't know what the "FLxxx en-route" is meant to mean.
Can only think that whoever is giving the clearance is using the phrase 'Climb to maintain FLXXX, request level change to FLZZZ en route'.
Aberdeen have agreements with Scottish for departures including agreed levels on Advisory and Airway routes and so Scottish normally never have the need to pass them a specific clearance and would not to my knowledge ever have to use a 'Request Level Change Enroute'.
If it was ABZ you got these clearances from, then someone there is who this query should really be aimed at. Anyone at Ice Station Zebra willing to step up to the stand ??
