Upshot

'Upshot' showcases hidden spaces at the top of London's highest buildings, from its great institutions to its residential homes, documenting the exotic through to the mundane.

It follows on from Alan Williams' previous explorations of subterranean London in 'Suburban' and the hidden destinations of the DLR in 'Sidetrack'.

Forming a key part of the London Festival of Architecture 2008, the exhibition will involve the hanging of large-scale images on and around the terraces of the National Theatre.