LOL Debbie - I think you are on the right track. The longer they can hold it, the better chance of TT. However - Jenna will hold it all in, then do 3 wees in the space of about 10mins.
We had her in knickers last night, and she is just in love wiht them. She would almost rather be in knickers than nudies I reckon. Anyway she walked into near our bedroom, then came back saying "wees" and pointing. I couldn't find thespot until I turned on all the lights, but luckily it was juuuuust on the tiles.
The night before she got up off the potty and did a wee right next to it. Ahh well.