Kate and Willian's royal move triggers Christmas chaos for shoppers amid security protocol
Motorists must now navigate a diversion extending over a mile
Princess Kate to set honour late Duchess of Kent during annual Christmas carol service
There will also be a festive walkthrough outside Westminster Abbey
William offers support as he is 'moved by courage' of Gazan children treated by NHS
The Prince of Wales has also sent his sympathies to the victims of the flooding in Wales
