There are plans afoot to rebuild Skylon, one of the focal points of the 1951 Festival of Britain on London's South Bank and a key part of its identity. What other structures in the UK, if recreated, would reflect the UK's spirit of invention and boost our sense of civic pride?

'London has many disused Underground stations. We should follow Plymouth's lead and fill the stations full of water and turn them into scuba diving destinations.'
Mark Smith, Creative director, Start