Well yes, ShotOne, I didn't wish to imply that a clip round the ear should be the sole control option. Example and explanation is certainly preferable.
The most impressive discipline I witnessed being applied to some child was when I was driving slowly past a group of traditional gypsy caravans in deepest, darkest Lincolnshire in 1969. One of the gypsy children suddenly darted out across the road and I came to a sudden halt. A rather large, huge in fact, gypsy woman picked it up by the scruff and gave it an almighty wallop on the backside - which I could almost feel inside the car. "Sorry, mister", she called, as I set off again. But I bet he didn't run across any more roads for a while!
Are Happy Hours or 'Twofers' still in vogue these days? The rules you describe, Roly, are exactly those I recall.