Thornton v Mitchell

Facts

A bus driver reversed his bus relying on signals given by the conductor, who was at the rear and responsible for watching the road behind. The conductor negligently signalled the driver to reverse when it was not safe, and pedestrians behind the bus were struck. The driver could not see behind the bus and had relied on the conductor.

History

The justices dismissed the charge against the driver of driving without due care and attention, finding that he had not been careless, but convicted the conductor of aiding and abetting that offence. The conductor appealed by case stated.

Issue

Whether a person can be convicted of aiding and abetting an offence of driving without due care where the driver himself has committed no offence.

Held

Appeal allowed; the conductor's conviction was quashed.

Ratio

• Secondary liability for aiding and abetting depends on the commission of the principal offence; where the alleged principal has not committed the offence, because his driving was not careless, there is no offence that the secondary party can have aided and abetted.

The judgments

Key reasoning

• The justices' findings established that the driver had driven with due care in relying on his conductor, so the actus reus of the principal offence was absent.
• Aiding and abetting is not an offence in itself but a mode of participation in an offence committed by another; absent that offence, the accessory's liability has nothing to attach to.

Where it fits in the module

In the complicity topic, the case frames the debate about whether accessorial liability should be derivative or independent. It shows the gap that derivative liability leaves where a culpable participant procures harm through an innocent principal, and it is the starting point for evaluating the later cases that find liability without a guilty principal, and the inchoate offences of encouraging or assisting crime in Part 2 of the Serious Crime Act 2007.

Criticisms

• The result leaves unpunished the person who was actually at fault, since the conductor's carelessness caused the harm while the driver's reliance on him was reasonable.
• The case shows that the derivative model can turn on the accident of which party performed the conduct element: had the conductor been driving, he would have been liable.
• Later decisions convicting a secondary party where the principal lacks fault are difficult to reconcile with Thornton v Mitchell unless it is confined to cases where the actus reus of the principal offence, rather than merely the principal's fault, is missing.