Pink Floyd fans will recognise this structure instantly - Floyd hung a pink inflatable pig between the two front towers for the cover of their 1977 Animals album. "The inflatable pig was tethered to one of the power station's southern chimneys, but broke loose from its moorings and, to the astonishment of pilots in approaching planes, rose into the flight path of Heathrow Airport. Police helicopters tracked its course, until it landed in Kent.