The Reading football team is planning an open-top bus tour later, in celebration of their promotion back to the Premier League.
There will also be a celebration at the Madejski Stadium, where the npower Championship trophy will be held aloft.
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Dressed in a hat and dark glasses, the singer and former X Factor judge seemed to travel around the Tube network completely unnoticed.
Ambulance chiefs said anyone with a long-term or chronic illness who feels unwell on Thursday should try to ensure they are not alone.
If you're struggling to stick to your New Year's resolution, this could help kickstart your enthusiasm.