I totally agree. They should be banned instantly. I have a 3 year old daughter and I try to limit the amount of advertising she is exposed too, but she is already aware of products from the ones she does see, so they do have power.
I would also like to see supermarkets banned from promoting junk food on BOGOF and 3 for 2 offers. Cigarettes are not allowed to be advertised, promoted or placed on any form of offer and the same should apply to junk food.