Also, when i parked at 9.30, there was a Mazda car adjacent and i took little notice. Coming back for a cup of tea 2 hours later, the Mazda engine was running and heat noises coming from it. The elderly owner had parked and just left it running so i opened it as it was not locked and turned it off. He may wonder where his fuel has gone but all he will think is he forgot to lock it. Never found a car left running in a car park. Thats a first. Of course, that Mazda engine was extremely quiet and a 2018 model with stop start button. No key needed