This is the banana cake I made for the high tea in February 2007. It's a recipe handed down from my friend's grandmother to her mother to her to me, so it must be traditional. Special effect: the baking soda foams up spectacularly when you add the hot milk to it.
Cream the butter and the sugar together. Add the eggs and the mashed bananas. Dissolve the baking soda in the boiling milk in a large container (if you use a glass measuring jug you can microwave the milk to boiling point in it) and add it to the rest. Sift the flour with the baking powder and mix that in too.
Grease a cake tin and sprinkle it with dry breadcrumbs. Fill it with the mixture (it should be about 2/3 full). Bake at 180 degrees C (350 degrees F) for about 35-45 minutes or until a skewer comes out clean.