Abstract
This submission has been co-ordinated by Mike Floate, with contributions from: Ralph Allen, Kath Dickinson, Peter Espie, Mike Floate, Allan Hewitt, Bill Lee, Alan Mark, Caroline Mason, Peter McIntosh, Colin Meurk, Alan Nordmeyer, Kevin OÕConnor, David Scott and Kevin Tate.
The version published here has been edited to remove minor errors and to ensure stylistic consistency, but is otherwise that submitted to the review working party.