Blitz the biscuits into crumbs in a food processor, or by bashing them with a rolling pin. Mix through your melted butter.
Press the buttery biscuit crumbs into your tin. I press my crumbs up the side a bit to give my slices more shape later and to help get it out of the tin. But totally optional. Put in the fridge to firm up while you get on with the rest.
First, mix the butter and sugar in a small pan and then slowly dissolve over a low heat for 6-8 minutes, stirring occasionally.
Continue to cook on low heat for a further 5 minutes, then very slowly add the cream and cook for another 1-2 minutes until the mixture has slightly reduced (thickened).
You can then remove the pan from the heat and allow the mixture to cool at room temperature.
Chop your bananas. I like to slice my bananas length ways, so that when you cut the pie later you get a good cross section, but you can just slice them into coins, about 1cm pieces.
Remove your tin from the fridge and pour your caramel over the base. Arrange your banana on top of the caramel and put them back in the fridge. If you've cut the bananas length ways, then lie the banana cut down down. Sprinkle over your salt if you're using.
Beat the cream cheese until smooth. Add double cream, vanilla and icing sugar and whip until thick.
Spread the cheesecake layer carefully over your bananas, so as not to disturb the other fillings.
Whip your remaining double cream and icing sugar until it forms soft peaks. Dollop this over your cheesecake layer.
Grate chocolate over the top and put in the fridge for four hours for the cheesecake layer to set.