Gordon Challand wrote: > You must remember my favourite saying. The fool is always one > step ahead of you. They will think of a way of doing something > wrong which you cannot imagine until they have done it. But not all fools are so inventive. Most make the same old mistakes. So it's still worth updating the SOP. Mike Collins Mike Collins MLSO3 Clinical Biochemistry & Immunology The General Infirmary at Leeds, Old Medical School, Thoresby Place Leeds LS1 3EX, UK [log in to unmask] 44 (0) 113 392 2915 The opinions expressed here are my own. My colleagues and employers may not agree with them. %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%