I see a couple people using it at the shops near me in the UK (but it's not that popular here either). It's pretty universally available in the bigger shops, but rare in the little metro shops. I really like just slinging my bag in the trolley and running around the store with a scanner. It's dramatically easier than unpacking a trolley for self-checkout or the old school checkouts. It's annoying when there are security tagged items though, because it defeats the purpose of the self scanning.