Soak the raisins in the rum for at least thirty minutes,then strain, keeping the rum.Butter the base and sides of a 20 cm wide x7cm deep square tin and then line with greaseproof paper

Heat the oven to 180C/fan 160 C/ Gas 4.

Gently heat the butter chocolate and the cream until melted,do not boil.Allowe to cool a little. Gently beat the eggs with sugar and carefully mix with the chocolate mixture.Fold in the raisins and the rum.

Pour into the tin and bake for 1 hour.for firmish texture a little less for a more moist texture. Allow to cool in the tin .Move onto a plate. Meanwhile make the chocolate glaze.Melt the chocolate,butter and golden syrup ,again do not let boil ,remove from heat.Carefully level the top of the cake with a sharp knife,then spread with glaze .Dust with the cocoa powder. or drizzle with a white chocolate pattern or writing.