There are fears over Olympic security after a known terror suspect entered the Olympic Park five times - despite being trailed by police. The alleged Al Qaeda militant was arrested after breaching an order banning him from the area.
It raises serious questions over security less than three weeks before the Games are due to start. Piers Hopkirk reports
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A lamp in the tower which houses Big Ben is to be switched off for the first time in more than 70 years.
Sir Bruce entertained audiences for more than seven decades.
Work in the tower will also pause over the bank holiday weekend.