I've got three kids under 8 and I've not had a problem with them messing with my PB 360. If they touch it (only when I ask them to), they are very careful with it. It's not as fragile as it seems.
I'm not sure who the offical seller in the UK is, but
http://www.greenreader.co.uk/products/pocketbook-360 sells them.
Good luck, I'm sure you'll love it as much as I do!