If modern Britain lives in a terrace house and loves a cottage, it cannot make its mind up about the high-rise flat. Is the skyscraper a blot on the landscape, or the answer to the national housing crisis?

For Dan Cruickshank, the idea of living high above the city streets really is the future once again. 21st-century London is the site of an extraordinary building boom. Hundreds of residential high-rise towers are being built at record speed, many hugely controversial, as private developers cotton on to what social housing idealists realised 60 years ago.