You're unfortunately stuck. As this wasn't a collision involving a vehicle, you have no entitlement to his name, address or insurer. It's a civil matter where he has caused damage to your property, rather than the use of his car too. What you can do is try and claim off the supermarket, as they may be liable whilst your vehicle was on their premises. It would then lie with them to try and trace the owner. But I think you'll probably be flogging a dead horse.