This second meeting in the series was organised principally by Denis Mollison and Eric Renshaw with the help of their respective departments and a grant from the Royal Society. The fifty or so participants were drawn from various backgrounds, both theoretical and applied, and a diverse programme of twelve papers was presented, embracing both the development of mathematical theory and the collection and analysis of field data. Many of the non-speakers contributed to the lively discussion which prevailed. Short abstracts of the papers are appended, and the authors would be happy to answer requests for further information.