Well, I'm glad you asked. It's one of these:And it looks like this:
The taste? Well, this one is grape, blackcurrant and raspberry, made with actual fruit juice concentrate and somehow manages to taste just like creaming soda. Not a bad thing, but not what I was expecting. If you feel the urge to obtain some "incredibly fizzy Vimto", you can get it up at the lolly shop in Leura, along with other random sweets from random countries.
Edit: Apparently you can obtain Vimto in cordial form in the local supermarket. Who knew???? (Well, I didn't....)