I looked in Mothercare and Superdrug today and found no NUK products at all. Superdrug sold very little baby stuff at all. Seems things have changed. Ah well, will be all the more exciting when I eventually find one!
Edit: Today I took a look in a Boots store. They had NUK bottles but not pacis. There were three types of bottle, wide-neck shortish ones with latex size 1 teat, taller version with silicon size 1 teat, and standard neck three packs. There were also spare teats sold in packs of 2, including size 2. I almost bought a new bottle and the size 2 teats (That's what I used to have but I threw it away in a purge phase at last a year ago). But that would have been around £6 so I decided I didn't need it. Kind of still want one though!