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LONDON, UNITED KINGDOM: Norwegian Prince Haakon (R) and his whife, Crown Princess Mette-Marit (L) participate in the lighting ceremony for Norway's Christmas tree, presented to the the Lord Mayor of Westminster and the people of London at Trafalgare Square 06 december 2001. The people of Oslo donate a Christmas tree every year to the people of London as thanks for their support during the WWII. This year's tree measures 20 metres and has been decorated with 500 white lights. (Photo credit should read NICOLAS ASFOURI/AFP via Getty Images)

LONDON, UNITED KINGDOM:  Norwegian Prince Haakon (R) and his whife, Crown Princess Mette-Marit (L) participate in the lighting ceremony for Norway's Christmas tree, presented to the the Lord Mayor of Westminster and the people of London at Trafalgare Square 06 december 2001. The people of Oslo donate a Christmas tree every year to the people of London as thanks for their support during the WWII. This year's tree measures 20 metres and has been decorated with 500 white lights. (Photo credit should read NICOLAS ASFOURI/AFP via Getty Images)