Then the Governments job is done. If Joe Public can be made to believe something, then that is the battle won. Governments have been doing this for ages. What will eventually happen in 2018, nobody knows, but if they can make people think that the drinks they currently consume are going to cost more, they can make a large percentage will stop drinking them now. I wouldn't even mind betting that this Levy/Tax doesn't happen at all by the time we get to 2018.