My mis-spent youth [70- 79]was predominantly spent controlling in East Anglia and over/through the London TMA. USAF aircrew were OK - perhaps because I got used to them, maybe because they were taught 'proper' at Base Instrument Schools at Bentwaters/Woodbridge, Lakenheath, Mildenhall and Upper Heyford.
There were variations, of course - 'Diverse Recovery' (wozzat?), the desire to burn fuel in holding patterns instead of getting on with it. But they spoke NATO, and were easy to handle in the vast numbers they had back then.
Perhaps being 'overseas' focussed their minds? Perhaps we (the RAF) taught them proper, so that you said Hazeborough instead of Happisburg? we all melded happily, thanks to ATCRU USAFLOs.
Could that work in the US? "No way, Juan"