The car was regularly serviced by the supplying garage, which they collected and delivered back after each service, while he stayed at home.
He had a problem after one such service when he went out the following morning to go to work, but couldn't get the remote to work, so couldn't get in. Called the recovery service, can't remember which, and they said it was a common call-out occurrence. Apparently the Leaf has a small capacity battery, kept topped up when the car is running, that runs small things such as remote locking, interior light, and parking light.
The service mechanic had left the interior light on unintentionally when he delivered the car back, the battery flattened, Number One Son couldn't get in.