Have a read at
http://www.ead.eurocontrol.int/eadba...2019-01-17.pdf as it explains what’s changing / changed in terms of communication, and what’s not. HF remains mandatory and there’s a lot more to communication that just the choice of HF or VHF that’s referenced here, specifically the mandate around Datalink in the NAT (again, a quick check of UK AICs will yield all that you need to know).
The ICAO (Paris) website has a number of related documents too at
https://www.icao.int/EURNAT/Pages/EU...F142A1E5BC9%7D check the NAT Ops Bulletins there.
@Stanley Eevil, never heard them described as “3 sisters” before (though I only go back around 30 years ��). Further change to Routes will happen in January 2020 when a new RNP2 route will be added close to T9. Keep a close eye on the AICs again for detailed of that in due course.
HTH ... RT