Because ovens do vary in spite of what the temperature gauge may say. If in doubt pop a thermometer in and it will tell you precisely what the reading should be. If your oven is not correct you can call the manufacturers to get it checked and adjusted.
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One member will receive a pair of cinema tickets to see Romeo and Juliet performed by the Bolshoi Ballet plus overnight accommodation for two guests at 11 Cadogan Gardens including full English breakfast and a traditional afternoon tea for two.