On further reflection I am coming to the opinion that LVP's for CAT 1 ILS approaches is a little bit of a red herring!
I believe (now) that we have Safeguarding/LVP's (at our airport with CAT 1 ILS)
not to protect CAT 1 approaches but in order to protect
departures which of course can continue at IRVR values much lower than arrivals.
From the UK AIP AD 1-1-7 para 2.12:
"Low Visibility Procedure (LVP).
Procedures applied at an aerodrome for the purpose of ensuring safe operation during Category 2 and 3 approaches and Low Visibility Take-off. (LVPs are initiated when the cloudbase lowers to 300 ft and is expected to lower further or the RVR falls to 1200 m and is expected to deteriorate further. They should be fully in place by the time the cloudbase reaches 200 ft or the RVR falls to 600 m.)"
Thoughts please! (V Interesting discussion BTW)
DD