20,000 ft wow, who was proviiding the ats. was it doncaster area centre or military. if you look on any airspace map you will find that above doncaster there is not any cas until fl245 therefore no control,
Doncaster area centre - wow, that's a new one! No control up to FL245 - what about the surrounding airways?
Does qcode actually know what he's talking about I wonder?