Looking at the Manual of Air Traffic Services Part One (ALL ATC'ers Bible) it states quite clearly, in an ammended page dated 28.12.01:. .. ."When transmitting messages containing aircraft callsigns, flight levels, headings, wind direction and speed, pressure settings, frequencies, transponder codes and aircraft speeds, each digit shall be transmitted seperately. The only exception to this is FL100 wich will be transmitted as 'Flight Level Wun Hundred'.. .. .Me thinks that your man has been given duff info.. .. .Would love to see that letter or the reference to it on the website - I can't see anything.