By Trevor Yorke 

By Susan Campbell 

By Neil R. Storey 

By Peter Matthews 

By Professor David Nash 

By Julian Hale 

By Roy Brigden 

By Trevor Pask 

By Twigs Way 

By Neil R. Storey 

By Peter Wotton 

By Professor Peter Doyle 

By Hans van Lemmen 

By Richard Loveys 

By Margaret Swain 

By H.G. Muller 

By Kathryn Ferry 

By Geoff Hayes 

By Sarah Jane Downing 

By Roger Putman 

By Trevor S Jennings 

By Tracy Dolphin 

By Michael Smith 

By Robert Copeland