It is an English skin-care and make-up brand, and I love it so much that even though I moved to the US in 1994 I still use it. I used to stock up when I went home, or have friends and family bring me products, but now I can get it at Target - yeah!
Some of my favorites are...
Boots Botanics Conditioning Clay Mask
Boots No7 Intensive Moisture Face Mask
Boots No7 Glycolic Peel Kit
The prices are very low, and the products are very gentle - I find most skin-care products too harsh for my skin, but I love these.