I'm from the UK and know we can't get Circus Cookies here, which is a crying shame as I love them!
Also s'mores and, while we DO have reese's peanut butter cups here, we don't have the cookie version, which are yum!
The best things we have here in the UK (in my sweet-loving opinion ) are:
Black jacks/fruit salad sweets
Rhubarb and custard sweets
Terry's chocolate orange bars
Raspberry and milk Drumstick lollies