Subtle difference in the UK:
Quote:
UK AIP ENR 1.7 paragraph 5.1.4 states ‘...when cleared for climb to a Flight Level, vertical position will be expressed in terms of Flight Level...
Unless... quote ENR 1.7
unless intermediate altitude reports have been specifically requested by Air Traffic Control.
Climbing in controlled airspace pilots will still reference an altimeter set to 1013 and read off a requested "passing altitude". Hope thats clearer?