Yesterday Littl'un called me to do the necessary when he'd been to the loo. I noticed he hadn't used his booster seat that goes under the toilet seat and asked him why. He announced proudly: "I don't need that anymore, my bum bum is too big".
So he has upgraded himself to the normal toilet! Bless him. Now if only he could wipe his own bum bum I would be a happy woman!