What's With the Increasing Trend in London to Build Homes Underground?

Last week I saw an episode of Grand Designs where a wealthy couple bought a rather large basement in a rather posh part of London and dug down many metres to extend their home in a world where the m2 of land is at its most expensive.  It seems, however, that a wealthy Canadian called David Graham has gone one step (or 4 storeys!) further and has submitted plans to triple the size of his mansion by digging down a whopping 50ft.

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