Mandatory Credit: Photo by Guy Bell/REX/Shutterstock (5658842m) The Tower of London lights a beacon at 20.30 on Thursday 21 April to celebrate Her Majesty the Queen's 90th birthday Queen Elizabeth II 90th birthday celebrations, London, Britain - 21 Apr 2016 The Chief Yeoman Warder lit the beacon at the Middle Drawbridge, accompanied by Yeoman warders (aka 'Beefeaters') in semi state dress with the White Tower as backdrop. The Tower of London is one of thousands of sites across the UK that will light beacons on Thursday 21 April to celebrate this special birthday.