Flying out of London on a foggy day recently I heard a bizjet inbound to Luton being given the RVRs (can’t remember exactly what they were but definitely below CAT1) and he was asked if he was able to make an approach. He answered in the affirmative. Then about a minute later he asked for the RVRs again and was told the same figures. At this point he reported that he couldn’t make an approach after all…