Is there anything else you like to take back from the UK that you can only get here without some difficulty you'd get back home?
When I used to make quarterly visits to North Devon, I would always stop at the (Woolworth's maybe?) on the High street and spend about £40 on every candy bar I could find. If I did this on the last day of the trip, most of it got home with me and I distributed it among the kids. Once I was given an extra week at the last minute and ended up spending £80 because I ate the entire first stash myself.