It was a 41 gun salute from different venues around London, all firing around noon. Those are the Kings Troop Royal Horse Artillery in Green Park and Hyde Park. It’s a mounted unit with teams of six horses each pulling a WW1 era 13 pounder field gun. I think they have six of them. Ron
http://www.telegraph.co.uk/news/ukne...he-throne.html
After the short advert!!