DFC
All I was saying is that FL40 is the lowest cruising level. I'm well aware that it is not valid on 075(M). FL35 is NOT valid as a cruising level. 3000ft amsl is the point at which you reset the altimeter, i.e. transition altitude, but the transition level in the U.K. is FL40 with the gap in between being the transition layer. This exists purely to give separation based on variations between the QNH and the QNE. You normally reset the QNH when it is passed by ATC when IFR or passing FL40 if VFR and flying levels.
Last edited by pilotincommand; 15th January 2008 at 20:44.