I travelled around London touching all the tallest buildings, taking a photo of the point of contact, and another looking up.
The Shard, Southwark 310m / One Canada Square, Canary Wharf 236m
Heron Tower, City of London 230m / 122 Leadenhall Street, City of London 244m
25 Canada Square, Canary Wharf 201m / Tower 42, City of London 183m
St George Wharf Tower, Vauxhall 180m / 30 St. Mary Axe 'The Gherkin', City of London 180m
BT Tower, Fitzrovia 177m / Broadgate Tower, City of London 161m
One Churchill Place, Canary Wharf 156m / 25 Bank Street, Canary Wharf 153m
10 Upper Bank Street, Canary Wharf 151m / Guy's Tower, Southwark 149m
Pan Peninsula East Tower, Isle of Dogs 148m / Strata, Elephant & Castle 147m