London's first helicopter sightseeing tours have been launched over London today. Starting from the heliport at Battersea, visitors will be able to get an aerial view of the capital. But it comes at a price - the cost per person starts at £199.
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The venue says it is in contact with promoters about a final decision, following the terror attack at the singer's concert on Monday.
Soldiers will replace armed police at many sites after security experts warned the Government that another terrorist attack may be imminent.
The threat level has been raised to critical by MI5's Counter-Terrorism Analysis Centre.