Our old Sainsburys didn't sell clothes, so I have never bought Tu before. Now we have a superstore I've been looking and they have some lovely things this season, the quality is good too. I've bought some very nice sweatshirts with a thin fleece lining and a couple of longer style cardies. They have a large selection of styles, which seem to have been added to every time I go in there. I need to stop!
You would definitely go though the self-checkout wouldn't you lol!
Now, if it was Tesco, you could scan as you shop, bury it in the bottom of the bag, and just hope you weren't randomly selected for a check when paying.