Privacy-insistent toddler - how the hell do you train?

[perfectstorm]

DS is fascinated by watching Daddy pee. He pees gleefully in the bath each night before sitting down. But he is obsessionally private when having a poo - says, "go away!" to everyone who goes near him and runs off somewhere discreet (this is a hassle if he decides to do it in a small shop...) he's actually very good about finding us afterwards and saying he's done a poo, can we change his nappy (on occasion he will have taken his trousers and pullups off already), but he was appalled and very distressed the one time we sat down and tried to coerce him into using a potty instead.

He knows poo goes down the loo as we've always flushed his before binning the nappies. He's perfectly aware of when he's going to poo or pee. He just doesn't want anyone near him when he does it, and thinks pooing and peeing is something you do alone and either in pants or on the floor (he's perfectly good with that!). He's 2.7.

Help?

[DrSeuss]

I think the first thing you have to do is establish where he got this idea from. My DS used to wonder at will in and out of the bathroom and I never tried to stop this so he never thought that bathroom stuff was anything private.

I think Mummy needs to aquire a special set of sunglasses which are so magic that she can't see anything he doesn't want seen but tell her if he needs help so that she can be in the room. Just plan your story and tell it with conviction and he will believe!