How about this one? It's from a Cadbury's cookbook.
Chocolate ripple teabread.
200g/7oz Bournville chocolate, broken into pieces
200g/7oz unsalted butter or margarine softened
1 teaspoon ground mixed spice
175g/6oz caster sugar, 3 eggs
2 teaspoons vanilla essence
225g/7½oz self raising flour
½ teaspoon baking powder
100g/3½oz Bournville chocolate to decorate.
1. Grease the base and long sides of a 1kg/2lb loaf tin. Put the chocolate in a heatproof
bowl,place over a pan of gently simmering water and leave until melted. Stir in 25g/1oz
of the butter or margarine and the spice.
2. Place the remaining butter or margarine, the sugar, eggs and vanilla essence in a bowl.
Sift the flour and baking powder into the bowl and beat until light and fluffy.
Spoon one-quarter of the mixture into the tin. Spread one-third of the chocolate mixture over
the cake mixture. Repeat the layering of the cake mixture and chocolate sauce,
finishing with a layer of cake mixture. Sprinkle with the chopped chocolate.
3.Bake in a preheated oven, 180C (350F), Gas mark 4, for 1 and a quarter hours
or until risen and a skewer inserted into the centre of the teabread comes out clean.
Leave in the tin for 10 minutes, then transfer to a wire rack to cool.