Marclover, I order mine of various websites, usually located in L.A and have them shipped over to the U.K whenever possible.
Here are a few that stock certain pieces from various Disney Couture collections, they are so cute, I love Kidada's Jewels.
xxxRosexxx
http://www.shopkitson.com/?pageId=2&manufacturer_name=Disney+Couture
http://www.jestjewels.com/dicoje.html
http://www.80spurple.com/catalog/index.php/cPath/225_402_611_521
http://www.regencies.com/advanced_search_result.php?keywords=disney+couture+or+walt+disney+fine&categories_id=&manufacturers_id=&pfrom=&pto=&dfrom=&dto=&x=64&y=14
http://www.adasa.com/brand--asp--MnfID--1087--afdiv--Disney-Couture-Jewelry.htm