Measure the All-bran, sugar and dried fruit into a bowl, pour over the milk, stir to mix, then cover and leave in a cool place overnight.
The next day, pre-heat the oven to 180 degrees non-fan/160 degrees fan/Gas mark 4.
Lightly grease a 2lb loaf tin (900g) and line with greaseproof paper.
Stir the egg, flour and mixed spice into the fruit mixture and mix thoroughly. Turn into the prepared tin (the mixture will only come half way up the tin) and level the surface.
Bake in a pre-heated oven for about an 1 hour to 1 hour 15 minutes or until well risen and firm. A fine skewer inserted into the centre should come out clean. Allow to cool in the tin for about 10 minutes, then turn out and leave to cool completely on a wire rack.
It will keep in an air tight container for a few days. If freezing, slice and separate with pieces of greaseproof paper to prevent from sticking together.
Serve sliced and buttered.