For the base, blitz the oats in a food processor until flour-like.
Add the remaining ingredients and whizz until the mixture starts to clump together.
Press mixture into the baking tray
Bake for about 10 mins until lightly golden at the edges, then leave to cool.
Meanwhile, put all the caramel ingredients in the food processor (no need to rinse it first) and blitz until it forms smooth, shiny clumps.
Using a spatula layer it onto the cooled biscuit base.
Allow to set in the refrigerator.
Melt chocolate 30-40 seconds in a bowl in the microwave then cover the caramel topping..
Allow to set then slice in cake bars.
This recipe curtesy of the BBC Goodfood website was intended to be for individual bars however reviewers said it worked better as a tray bake so that is what i opted for , i also followed their advice and doubled all the ingredients and i'm pretty pleased with the results.