The countdown to Christmas kicks off with Alexandra Burke and swarms of Londoners singing along to top Christmas hits by Tower Bridge.
The Quality Street Christmas sing-a-long includes Silent Night, The X Factor star's own No.1 hit 'Hallelujah' and the Quality Street favourite, 'Magic Moments'.
From 11am passers-by will be treated to several hours of the nation's favourite songstress in a winter wonderland complete with Christmas trees, snow and a church choir.
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