Where to buy real quality bedding?

As the title says, where to buy real quality bedding?

A few years ago I bought some duvet covers, pillow covers and fitted sheets from IKEA and they were amazing. They were very thick and very soft and amazing to lie on. But they don't seem to do them anymore. If anyone knows that I might still be able to get them there please let me know.

Besides that:

I am looking for something very soft and thick but I really don't know anything about bedding. So any help would be greatly appreciated.

I live in Belfast, Northern Ireland if location matters.

Thanks folks.