As many will know, the Transition level (When altitude readouts change from ft to Flight Level) in the US is FL180/18000ft. This is what is followed in IF, in the whole of the world. The problem is the transition level varies heavily in different countries:
UK (London): 3000 in open airspace, 6000 in the London airspace, sometimes different in airport CTRs (East Midlands for example is 4000)
France (Paris): 4000 (unless different on airport charts)
Malaysia, Singapore (Singapore and KL): 11000
Australia (Sydney): 10000
The Netherlands (Amsterdam): 3000
Germany (Amsterdam): 5000
Yet 18000 is used all of the time. So what about the altitude speech and selection changing according to the flight level? Even if it is just a general for each region (not using the airport charts).