These things are, sadly, not limited to London. There were plans in Bristol that started in the 1930s with driving a dual carriageway through one of the largest and most architecturally significant Georgian squares in Britain (realigning a statue of King William III in the process so his horse didn't stick out into the traffic), then in the 60s started to build a series of d-cs and elevated pedestrian walkways (the last remnant, a bridge to nowhere at Old Market roundabout, was removed last year) before finally being running out of money just before they – I'm not making this up, there were fully developed, shovel-ready plans – concreted in the docks.