Trafalgar Square is now feeling festive after the lights on its Christmas tree were lit on Thursday night.
At 20 metres tall, the tree is a Norwegian spruce donated from Oslo as a token of gratitude for Britain's help in the Second World War.
Norway's Ambassador to the UK Mona Juul joined the crowds during the ceremony.
On Twitter, she said:
"The Norwegian in Trafalgar Square is a symbol of friendship between our two countries - past, present & future - a symbol of hope and unity for young & old. Merry Christmas and God Jul!"
Watch the moment when the lights were switched on: