You're lucky. Shoes in my size rarely exist in Paris I can't order any of those cute shoes from Boden. Usually Zalando and Amazon have extremely limited stock in my size.

Being 'unusual' sizing is tough. You should be fine, however.

If you are interested in Next, go online, find the item numbers you want, check if they are instock online, then go to a store and do the next day delivery. It's an easy way to 'shop' from the catalogue without going through their onerous account creation, which you won't be able to do anyways without a UK address if you are trying to do UK delivery.