A series of events has been taking place across the capital, with announcements on the tube by Barbara Windsor, and a spitfire in Covent Garden. The Prince of Wales has also added his support to the campaign
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British police have closed some traffic outside the road leading to 10 Downing Street.
Metropolitan Police officer, Tom Harrison, has been crawling the course since the race began on Sunday morning.
The Old Bailey heard how Syed tried to get weapons online, including a bomb vest, and trawled the web to find a busy area launch an attack.