New figures show a record number of visitors to London so far this year. 7.9 million flocked to the capital in the first six months of 2013, a 7.7% boost on the same period last year.
The figures from the latest International Passenger Survey also reveal 12 times as many tourists visited London as the next most popular UK city, Edinburgh.
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A man reportedly armed with several knives has been arrested in Whitehall on suspicion of planning a terror attack, police have said.
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.