And I generally find that if you read back everything i.e. an exact mirror of what ATC has just said saves more time overall than learning phraseologies from AIP
That really helps when descending at 300 kias, and around 3000' FPM, on profile and the aircraft captures the last assigned level because one can't get a word in edge ways for all the reading back of "copied no IFR traffic" etc etc etc.
