Oh sorry I didn't read that properly (twit!) I don't know about flavoured ones, it would depend on how they're flavoured (eg like WKD or like Sourz or Corkeys) and it they have sugar etc. in them.
I would imagine they are 2.5 then, prehaps syn 3 per 25ml until someone with the book, or access to the online directory turns up, sorry I can't be more help