Topslide, yes, we could go into the minutia of LVPs but as I mentioned, I was trying to keep it simple for non-pilots/ non-IR pilots.
As for the fire, I guess if it actually did have a serious engine fire (and I mean serious) then continuing into BHX may well have been the most sensible decision, even if it was Cat III. If my aircraft was seriously on fire and the options were follow the ILS to landing at the airport I am at (even if below limits) or fly another 15 minutes up the road and hope it hasn't gone out of limits/ we haven't burnt out by then I think I know which one I would opt for!!!