Guest Stars Tristan Sturrock as Zacky Martin Luke Norris as Dwight Enys Pip Torrens as Cary Warleggan Caroline Blakiston as Aunt Agatha Ed Browning as Paul Daniel John Hollingworth as Captain Henshawe Richard Hope as Harris Pascoe Crystal Leaity as Margaret Vosper Robert Daws as Dr. Choake Gracee O'Brien as Jinny Martin Michael Culkin as Horace Treneglos Rory Wilton as Richard Tonkin Patrick Ryecart as Sir Hugh Bodrugan Mark Frost as Tom Carne Hywel Simons as Harry Blewitt Jason Thorpe as Matthew Sanson Daniel Cook as John Treneglos Derek Frood as Captain Bray Geoffrey Bersey as Chairman Billy Geraghty as Blight Gruffudd Glyn as Sergeant Tremayne