In tonight's opener the intrepid duo go wartime. They dress up in genuine 1940s clobber and grab their ration books for a week to find out what Mr and Mrs Joe Public ate during the Second World War. The diet - including Spam, dried egg, Wheaties, special margarine, the National Loaf and vast quantities of potatoes - were genuine Government-approved foods and the recipes are authentically prepared with the help of chef Allegra McEvedy.