I got mine from argos:
http://www.argos.co.uk/static/Product/partNumber/8426435.htm
They work brilliantly and big enough to fit my fat girls in!
The babies are a handful, they are still learning the jist of it, they only get the tips done to keep on top and get them used to it. Chilli and Salsa are ok with it, they've had them done since babies so are used to it. Mavis never had her nails done before I took her on last year, she's 5, so they were a mess. Thankfully they are shorter now and getting there, but they are thick and horrible and I don't think they'll ever be perfect. She's comfortable with them though and they are short now so it helps.