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Open House London begins

Celebrating 50 years at the top: The iconic BT Tower

The London Open House gets underway today with hundreds of usually private buildings open to the public.

The festival began in 1992 as a way of celebrating London's architecture by allowing people inside for one weekend a year.

Many buildings are free to enter while some more popular ones - including no 10 Downing Street - are limited by a ballot.

As part of marking its 50th anniversary, the BT Tower has opened itself up also through a ballot, allowing 80 people an hour to visit. It was last open to the public in 2011.

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