I've got a "modern" retangular toilet and can't find any trainer seat that will fit over the big seat wihtout being very wobbily and having loads of gaps that DD could trap a hand in. Have tried one from John Lewis that goes under the seat, and has a top like a pottie, but that still moves loads and is impossible for my DD to get on/off herself (her arse onto it, not the seat on the toilet IYSWIM). I remember seeing fancy training seats with steps somewhere on the internet awhile ago. would they work with my toilet or does anyone have any other ideas?