In reply to balmybaldwin:
Couldn't you tell be the noise?
On the day they were grounded, I was due to pick my Mrs. up from Gatwick, so I thought I'd take my son early and watch it take off, as we'd seen it from the car two weeks before.
Any how we waited and waited, then picked my Mrs up without seeing it obviously.
I used to work in Camberly about a hundred years ago, we'd watch it fly over every day, and every Monday (I think) Broadmoor siren would go off, happy days