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You'd be forgiven for assuming hundreds of people dressed as Santa bolting through London is some kind of festive initiation ceremony, but the London Santa Dash is actually a fun run raising money for Great Ormond Street Hospital Children’s Charity. Sign up to sprint a 5km or 10km route in Brockwell Park while wearing red and white threads. Registration includes the Santa suit and mulled wine/mince pie reward at the finish line. If you just fancy heading along to cheer the runners on there'll be a choir and a brass band for entertainment.