Photos: BT Tower at 40

Photos: BT Tower at 40

Summary: London's landmark through the years - in pictures

TOPICS: Networking

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  • Today the tower handles around 3,000 switched calls per day, 99 per cent of all live football and terrestrial television passes through it and it is a Grade II listed building.

  • It cost £2.5m to build and can stand up to 23 centimetres shorter in winter than it is in summer - because of contraction and expansion - and is designed to sway no more than 20 centimetres each way in winds up to 100mph.

Topic: Networking

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