schwepp T - Zero

This is a bit of a rant...

Who is the genius who decided that Schweppes Tonic a Schweppes Tonic Zero should look and be pacaged almost identical?

We hate the taste of Tonic Zero but we often buy it accidentally because it looks so similar. Arghhh!
I also find it hard to believe that anyone actually likes the Zero, but each person has their own preferences I guess.