Just noticed this at Tesco. My son wanted some for Christmas to be like Harry Potter but they are £14.89 for 4 on Amazon so Father Christmas "forgot" them.
Tesco are now selling them for £1.80 a bottle imported from America.
Apparently tastes very similar to the one you get on the Harry Potter studio tour. They are non alcoholic so great for kids and Harry Potter themed parties. 355ml glass bottle and gluten free too if that's a consideration for youVirgil's Flying Cauldron Butterscotch Beer £1.80 Tesco