About an hour ago Donald and Theresa held a press conference at Chequers which I watched on TV.
Shortly after it ended POTUS departed in one of the two Sikorsky VH-60N helicopters en-route to Windsor Castle for tea and cucumber sandwiches with HMQ.
That left three V-22 Osprey aircraft on the lawn. The drama over I went a made a cup of tea.
A few minutes later I heard a lot of airborne noise and, being fleet of foot, (stop laughing) nipped outside just in time to see two of the Ospreys at fairly low level.
I don't know if I'd missed the third craft or whether that had gone somewhere else, but I was astonished at the speed of the things. They must have been doing the best part of 200 knots.
The ever reliable
Wiki says they have a max speed of 275 knots at sea level.
A very impressive sighting, if somewhat brief.
This is from the Farnborough air show of 2012.