IMHO this whole subject makes me very anxious. The UK seem hell-bent on publishing procedures and terminology that require PhD-level linguistics. "Caution stepped climb", "Descend Flight Level two hundred, expect FL180 by TIGER", "Climb now", "Intercept the localiser", followed by "descend with the glidepath", etc, etc.
I'm now retired, but although I reckon British ATC are still the best, their procedures, airspace design, and terminology were always unnecessarily complicated.
US controllers were "good in parts", but their procedures, airspace design and terminology were mainly simple and clear.
I always thought that US controllers should spend a couple of years in the UK, to learn how to talk properly.
UK controllers should spend a couple of years in the US, to learn how to integrate IFR and VFR traffic, and accept a practice approach without having to book a day in advance.............