The Newcastle headsets were (don't know if they still are) the Airlite 2003T, from the same stable that brought us the classic old warhorse, the 62.
Seems like there is quite a lot of choice out there for the ATC industry. Several manufacturers, monaural or binaural, circumaural or supraaural, dynamic or electret mike, curly or straight cable and , of course, price. Speaking as a non-insider, I would venture that price is probably the prime factor these days. I'm guessing that modern transmitters and VCCS can handle just about any type of microphone and headphone impedance so the choice will be the cheapest, providing it's a tough set.
If I were in ATC, I think I'd be looking for circumaural, independent headphones for splitting RT and phone/intercom, dynamic mike, curly cable, inline PTT and as light as possible without being flimsy. Plus a price tag of around £150 - £200.