Jubilee Tower was built 1810-12 to commemorate the Golden Jubilee of George III. It originally featured a central obelisk and turrets at the corners, but the former was destroyed by a storm in 1862, and subsequently the latter were lost too. The current layout and state of repair are the results of renovation in the 1970s following the investiture of the current Prince of Wales in 1969.
As I've already mentioned, since my teens, with a gap of 6-7 years, a family tradition has been to see in the New Year here.