Dear God I apologise! You are quite right, tunnel vision on my part.
Don't apologise.
Lockerbie, while tragic, is entirely irrelevant in this context.
Unless you are suggesting that no 747s, indeed no commercial aircraft at all, should overfly any part of the UK lest they should be downed as a result of terrorist activity.
I do agree, however, that had the fans on BAW38 stopped a couple of minutes earlier, we would not be having a debate at all on whether Heathrow should remain open.