Specifically related to the OP I fail to see how they're going to make this stick, unless it becomes a criminal offence akin to talking on a mobile phone or breaking the speed limit in a car. Then again how ridiculous does that sound: "£30 fixed penalty notice for smoking at the wheel." Next on the list eating...
The eating one is already in place....My G/F's colleague had an open bag of crisps NEXT to her, and she got stopped and had a £30 fine or so