I would like the answer to a query regarding using a Meat Thermometer. I have just purchased one and noticed the instructions quote 170c for beef. Surely this must depend on the cut, for instance would it take the same time to reach 170c in a both a sirloin joint and a briscuit joint? If so, the sirloin would be cooked o/k but the briscuit would not. Thanks for any information on this. wallie