Prepare the banana flavored blancmange according to the packet instructions, incorporating the sugar and specified amount of low-fat milk.

Mix until the mixture is smooth, then gently fold in the whipping cream.

Cover and refrigerate to cool.

Once cooled, thoroughly whisk until a thick consistency is achieved; divide the mixture into two equal portions.

Melt the Cadbury's Bournville chocolate and allow it to cool slightly.

Slice one banana and gently fold it into one half of the custard along with the vanilla essence. Incorporate the melted chocolate with the remaining custard, adding 2 tablespoons of low-fat milk.

Distribute the creamy banana mixture among the serving dishes, or alternatively, evenly spread it at the bottom of a larger trifle bowl.

Generously sprinkle the majority of the crushed macaroons over the banana layer.

Set aside some banana slices for decorative purposes. Divide the remaining banana slices among the serving glasses, then top with the chocolate mixture.

Adorn each glass with a Cadbury's Flake, or arrange the Flakes around the rim of the larger bowl. Garnish with a sprinkle of macaroons and reserved banana slices.

Chill until ready to serve.

Enjoy cold.