1. Claude P.R. Heath, Department of Media Arts/Information Security Group, Royal Holloway, University of London, Egham Hill, Egham, Surrey, TW20 0EX, U.K. Email: claude.heath@rhul.ac.uk. Website: https://pure.royalholloway.ac.uk/portal/en/persons/claude-heath.
2. John G. Stell, School of Computing, University of Leeds, Leeds, LS2 9JT, U.K. Email: j.g.stell@leeds.ac.uk. Website: https://eps.leeds.ac.uk/computing/staff/258/dr-john-stell.