You are spot on Javelin Boy and Easy Street
HM Gov. would surely ensure they keep it in reserve for response use to anything big going off in London?
I can't begin to think of how, on at least a hundred times without Northolt's ILS I'd have ever got into the centre of London from a beautiful city near the Welsh border and more importantly, with the passengers, I was carrying and a very very low overshoot onto the heli lanes. The Bovingdon radial 233? (Can't remember) Used to scare the crap out of me in poor weather!