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The 'Walkie Talkie' and 'Cheese Grater' buildings, seen here under construction in June 2013

The 'Walkie Talkie' and 'Cheese Grater' buildings, seen here under construction in June 2013

The Post Office Tower - finished in 1964 and opened in 1965 - stands 627 feet tall

The Post Office Tower - finished in 1964 and opened in 1965 - stands 627 feet tall

St Pauls Cathedral - 365 feet high to the top of the dome - completed in 1710

St Pauls Cathedral - 365 feet high to the top of the dome - completed in 1710

London's tallest landmark The Shard - at 1016 feet - completed 2012

London's tallest landmark The Shard - at 1016 feet - completed 2012

St Pancras Station, Euston Road - completed 1873 - height (clock tower) 270 feet

St Pancras Station, Euston Road - completed 1873 - height (clock tower) 270 feet

A near edge on view of the 385 foot tall Centre Point building, The Post Office Tower can be seen in the distance, just peeping round the left hand side.

A near edge on view of the 385 foot tall Centre Point building, The Post Office Tower can be seen in the distance, just peeping round the left hand side.

The Post Office Tower (Telecom Tower) - completed in 1964 - height 627 feet

The Post Office Tower (Telecom Tower) - completed in 1964 - height 627 feet

London's smallest landmark - The ornamental fountain in Piccadilly Circus (pictured here in 1963) - height 36 feet to top of statue

London's smallest landmark - The ornamental fountain in Piccadilly Circus (pictured here in 1963) - height 36 feet to top of statue

The Post Office Tower (AKA The British Telecom Tower) - 627 feet tall - completed in 1964

The Post Office Tower (AKA The British Telecom Tower) - 627 feet tall - completed in 1964

Battersea Power Station - height to top of chimneys - 338 feet

Battersea Power Station - height to top of chimneys - 338 feet

The Canary Wharf tower group - heights from left to right, The Citigroup building 656 feet, Nö1 Canada Square 770 feet, The HSBC tower 656 feet and The Barclays building 512 feet.

The Canary Wharf tower group - heights from left to right, The Citigroup building 656 feet, Nö1 Canada Square 770 feet, The HSBC tower 656 feet and The Barclays building 512 feet.

The Shaftesbury Memorial Fountain, Piccadilly Circus - completed 1893 - height 36 feet

The Shaftesbury Memorial Fountain, Piccadilly Circus - completed 1893 - height 36 feet

Aerial view of the 36 feet high Piccadilly Circus fountain and sculpture - taken in the 1970s

Aerial view of the 36 feet high Piccadilly Circus fountain and sculpture - taken in the 1970s