FPOBN, UK already has a difference to ICAO as I described above (wake separation to 4 dme not threshold). That's why I don't see the relevance of the info you've posted. If ICAO adopts RECAT I cannot see UK adopting it. The drop in movement rate at heathrow would be too great.
Do you believe the UK CAA would risk heathrow by adopting it when the present system has worked for many years?
Your quote under 6.2 in your last post was what I was getting at earlier when I said both flight crews are requested to file (sorry if that wasn't clear).
Work is ongoing to develop time based separation at heathrow, where the time interval between arrivals will be constant but the gap will vary according to the head/tail wind. How does that fit with RECAT?