With those restrictions in place, why would anybody hire someone on warfarin in the UK? What happens if the INR is out of range 12hrs before a flight and one is in a far away place with no chance getting another crew member on time? Mind you other EASA countries request one INR value between 2 and 3 once a month just like the FAA. Why invent the wheel new if some other authority has years of experience with thousands of pilots?