Oh Andy I had a good laugh at your story!!! We are going through the exact same thing ATM with our DS. We are TT right now too, and since the nappy came off the finger tends to graviate towards the back entrance more and more. What's worse, we get that finger stuck up our noses a dozen times a day sometimes, with a 'poo-wee' comment. I try not too scold him for it too much, I think it's just a stage. He did it in front of my neighbour once though, he ran out half naked and showed her his smelly finger. She was laughing so much when he wasn't looking, she made me see the funny side.