There are many websites to purchase Party Wear Choker Necklaces online in the United Kingdom, but some popular options include ASOS, Boohoo, Missguided, and PrettyLittleThing. Other options include Etsy, Amazon, and specialized jewelry retailers such as Swarovski and Pandora. It's always a good idea to compare prices, read reviews, and check shipping and return policies before making a purchase.