Why should petrol retailers expect the police to hot foot after those who simply forget to pay for their fuel?
I know somebody who once innocently drove off from a filling station without paying for petrol. She'd wanted to buy other items so she'd driven her car forward from the pumps into a parking bay. When she came back out again there was no "OMG, I forgot about the petrol" moment of realisation. She just got in and drove off.