I don't know. I know the law says that it's fine as long as it is 20m from the entrance to the shops, but I encounter people smoking in or right next to the PWP parks at least once a week at our local shops. It's a pretty safe bet that there are going to be children there and it takes a while to get them out of the car, pram up and down, shopping in. I know many playgrounds are now smoke free. Thinking about talking to centre management because it's also semi-enclosed.