Many of my U.S. colleagues seem puzzled when I wince at their calls like 'passing flight level twenty-three point six climbing to flight level two seven zero'
Maybe they say it that way because Angels without Cherubs is clearer. Don't start on Devils. 😏
Regarding transition alt; I always believed it was above the highest MSA. I never understood the need in the UK for different TAs. How about a global TA?