Something like this I guess?
http://www.raf.mod.uk/raflyneham/raf...55130C1227.pdf (opened on 18 May 1940 as Number 33 MU).
They speak of pression regions. This refers to Altimeter Setting Regions (ASRs). The QFE (Field Elevation) is for the field reading only. So indeed VBF-12_Gosling's, Enroute Supplement - Channel, is handy for the fields on approach and operating (thank you for those!). Most of the time (nowadays) the standard pressure setting 1,013.25 [hPa] is used for transits on flightlevel. Imho when running a dedicated server (and for the die-hards) it could be the case that the settings are given in a briefing. On deciding the field the pressures are given and the pilot takes note.
And for those that can't be bothered with setting up the gyro's compasses and altimeters.. ..