Presents papers given at the conference held by English Heritage in 1998, which explored ideas relevant to the conservation of listed buildings of the second half of the 20th c. Contributions are: 'Style or substance: what are we trying to conserve?,' by Alan Powers; ' This is tomorrow: the history of post-war architecture in England,' by Elain Harwood; 'Defining an approach: a methodology for the repair of post-war buildings,' by Susan Macdonald; 'Towards the fully integrated building: servicing post-war buildings,' by Jeff Parkes; 'Plastics: the first universal building material,' by Anthony Walker; ' The use of concrete in the post-war era,' by Michael Bussell; 'The deterioration of reinforced concrete: an introduction,' by Jimi Fadayomi; 'Repairing reinforced concrete: an overview,' by Paul Lambert; 'Conserving concrete: defining an appropriate approach for listed buildings,' by Kevin Davies; 'The development of clad frame construction and implications for conservation,' by Peter Ross; ' The glass and metal curtain wall: history, diagnostics and treatment,' by Stephen J. Kelley; 'The Lansbury Estate, Keeling House and Balfron Tower: conservation issues and the architecture of social intent,' by Martin O'Rourke; 'A future for Park Hill,' by Andrew Beard; 'Fallingwater: solving structural problems,' by Robert Silman; 'The Clerical Medical and General Building, Bristol: preserving the concrete aesthetic,' by Kevin Davies; 'Preserving heritage or revaluing resources?,' by John Allan; 'Conservation resources for post-war structures,' by Michael Stratton. ;