Thank you all for your help. Apart from not preheating the cooker, which the instruction booklet says not to do, I am doing everything else suggested.
I did use 2 separate packs of beef from the supermarket as I was making double. As some of the meat was OK and some was inedible, I think I have to conclude that I got some inferior meat in one packet. Oh well, Try again!
Disappearing contributors - part 2
