the link Jangly provided is a shop in my town, which does indeed sell v nice stuff but it's only the same character melamine stuff that can be bought (more cheaply) elsewhere.
Mothercare do a good selection.
The character type plates may offend an adult's aesthetics, but I find children adore them (ds is 3) and we've got a few different ones so they can all choose what plate to have their tea off when they come round.
For a plain thing, the best one I've found for a baby who wants to feed herself but is a bit uncoordinated (!) is the baby bjorn one. I got mine from Mini Marvellous but I've just looked on their site and can't find it there now.
it's good though as it's a good chunky flat shape which is hard to either knock over or push off the table.