This is one of my pet peeves too Sarah!! Its like teaching your child one language only to have to learn a new one when they are older. My favourite dislikes are " ni ni's" instead of "bed time" brmm brmm for car, actually there's a huge list LOL I have had children get to school still saying things like that and it just sounds terrible. Riley says thankyou not ta but I must confess the girls said ta!!