Method:
Place the cream in a pan and bring to the boil. Place the chocolate in a bowl and pour over the heated cream, whisk until combined. Cool in the fridge for a minimum of two hours (ideally overnight). Whip the mixture to soft peaks, then add brambles and whip to firm peaks.
Cream together the butter and sugar, add the dry ingredients and mix well. Roll out like a sheet of biscuit to about 1cm thick. Bake at 180C, checking after 15mins, take out when it is a nice golden brown, cool then break into a crumble. Bring milk and cream to the boil; whisk egg and sugar together. Take the milk and cream mixture off the heat and carefully whisk into the egg and sugar mix, add the vanilla. Whisk slowly on a gentle heat until it thickly coats the back of a spoon, cool.