In response to the outbreak of Phytophthora on National Trust properties in the South-West of England, Dr David Slawson (Head of Pest and Disease identification programme at the Food and Environment Research Agency) was contracted to develop a strategy and prepare guidance for the Trust to deal with the problem. As well as preparing guidance for Phytophthora, Dr Slawson has developed a set of notes to cover other areas of plant hygiene and biosecurity advice. We are most grateful to Mike Calnan, Head of Parks and Gardens at the National Trust, for permission to make these advice sheets available here.