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Put the caramel sauce and chopped chocolate in a small saucepan and heat gently, stirring, until the chocolate has melted (or place in a heatproof bowl and blast it in the microwave for a minute, stirring halfway through). Leave to cool slightly.
Cut 4 of the Oreos in half and roughly crumble the rest. Layer alternating scoops of the two ice creams in sundae glasses, along with the sliced banana, crumbled Oreos and dollops of the chocolate caramel sauce. Top with the halved Oreos and serve