Although we don't have STIR/SHAKEN in the UK, when Ofcom most recently revised the rulebook governing the operation of communications services in the UK — the General Conditions of Entitlement — they changed the rules around the presentation of calling line identification, to impose tougher obligations on communications providers in an attempt to cut down on "spoof calls". Personally, I'm sceptical that this will achieve much, especially in the short term, but it is definitely something which is being looked at.