Amy Johnson was a pioneering British aviator and she became famous when she flew solo from England to Australia in 1930. What a great and dangerous task for a woman in those times! I found in my Mother's cookbook. She had a couple of versions of this recipe, but this is the one she seemed to use. This was a popular recipe here in Australia, with lots of housewives in the 1930 and 1940's. It was a handwritten recipe, in mum's day everything was written so differently to today, some ingredients not written in the ingredients but listed in the directions, no oven temperatures given.......... so I have had to reinterperate this recipe.. N.B. A lemon Icing is needed to ice this slice, but again no recipe given for that, so use your own favourite lemon icing.