Have a look here as well http://www.thedarkangel.co.uk/ I got my bridesmaids dresses from here, The Christina dress for the grownups and the Lily dress for the little one. They are outstanding quality and super fast delivery. They also do a made to measure service.
Yes I did have to pay import duty but not too much and the prices on Dressbuilder are incredibly reasonable. Lovely quality of material and they are very friendly as well.