1. Scottish Crop Research Institute (SCRI); Invergowrie Dundee DD2 5DA UK
2. East Malling Research, New Road, East Malling, Kent, ME19 6BJ, UK, and Centre for Food Security, School of Agriculture, Policy and Development; Univ. of Reading, Reading, RG6 6AR, UK. Scottish Crop Research Institute is now called The James Hutton Institute
3. Division of Civil Engineering; University of Dundee; Dundee DD1 4HN UK