Saffy, yes I bought a potty last week. I had it out and let her go nappy free for about an hour before bath time. She sat on it a lot, but sat on the rug for 5 minutes (while I was on my phone!) and did a wee on the rug! Then sat back on the potty. I have only had nappy free time a couple of days after that. I need to be watching her and have nothing else to do so I can keep an eye which is proving very hard!
I wonder what kind of toilet training 'program' your friend is using? I'm not in a huge rush to have it established here, but if I have troubles or she just doesn't get it I will might give it a go (so keep a copy handy )