Meet Bob. Bob hired a TfL/Santander bicycle for £1.65/30minutes and lost it.
Bob has presumably committed a breach of contract, but has he committed a criminal offence?
Now meet Alice. Alice hired a car for £30/day from enterprise. She also loses it and fails to return it. Has she committed any criminal offence or are these situations purely civil wrongs?
Does the answer change if it is a DVD from Blockbuster rather than a car or bicycle?