"The typical case of persons acting in concert that comes before the Court is in charges of house-breaking. Let me illustrate it by an example. Suppose that, say, three men are driving along at night and they see a house in darkness with a lot of newspapers and milk bottles at the gate and one says to the others: 'That looks as if it would do.' The car pulls up, two of the men get out, and one of them stays in the car behind the driving wheel with the engine running. The other two go to the front door and there one of them breaks a glass panel beside the door, puts his hand through and unlatches the door and throws it open. The third man goes inside and collects valuables and comes out while the man who opened the door goes back to the gate to keep watch, and never enters the house at all. Now in law each of those three men can be found guilty of the crime of house-breaking, the elements of which are breaking, entering and stealing, yet obviously the man who sat throughout behind the driving wheel outside ready to drive the other two away when they had got the goods did not break anything, and he did not enter anything, and he did not with his own hands steal anything, and the man who broke the glass never touched the goods. But in law if a jury is satisfied that the three were acting in concert under an understanding that they had reached - communicated between them more by actions than by words - an understanding under which, between them, they were to commit this house-breaking, then in law they are all guilty of the offence and it does not matter which part each played in the commission of the offence. You can imagine that cases can often arise in which, in circumstances such as I have described, the Crown is not able to prove which man did which act. It may not even be able to prove which was the man behind the wheel. Now that is an illustration of the operation of this doctrine of acting in concert."