Watch: Trafalgar Square's Christmas tree is switched on

The lights of the Trafalgar Square Christmas tree have been switched on.

Every year since 1947 Norway has sent a tree to Britain as a thank you for its support during World War Two.

The near-20m-high (65ft) Norwegian spruce, which is around 70 years old, was draped in energy efficient bulbs before being lit up in a ceremony on Thursday evening.

The spruce, dubbed as the "world's most famous Christmas tree" by City Hall will remain in situ until 5 January, when it will be chipped and composted.

Video by: Harry Low and Richard Milliken