Guys
At the risk of sounding a bit like "it's God here" can we be a bit less authoritative about what "we" do in the UK - I suspect some of what "we" do is governed by Company Ops manuals.
FWIW, in the UK, for precision approaches my operator uses 1000' agl as the control height ( no mention of 4 miles/ markers), and RVR deterioration or improvements after passing that point must be ignored.......( so if it drops below minima you do not have to go around.
Standing by to be flamed.........