It often happens thus: a normal busy day, with eveyone going about their business, and suddenly this lands in the choir school playground.
There was distressing news; scaffolding at a building site near Victoria Station had collapsed, badly injuring a workman. The Air Ambulance service has used the playground before, being the only clear space in the neighbourhood for a helicopter to land.
No notice can be given on these occasions, and we were fortunate that it was not playtime and the boys were all in school. The helicopter gave the playground a great clean, sweeping away leaves and debris that would normally have to be brushed up by hand.