Big Ben joins 2012 bells record bid

Big Ben is to chime non-stop for three minutes to help ring in the London 2012 Olympics.

Special permission had to be gained for the hour bell at the Palace of Westminster to be allowed to toll out of its regular sequence.

It will strike more than 42 times between 8.12am and 8.15am on July 27 to herald the beginning of the first day of Games.