I would love to try this but although I have heard of graham crackers and cool whip, I have no idea what the British equivalent would be. Also I have never seen canned pumpkin over here. And maybe the vanilla pudding you have is different to ours. Confusing isn't it! I get so many great recipes off American sites and then spend ages trying to convert the cups to grams! I am off to do some googling see if I can't get it figured out.
Thanks!