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No reliable answers, then? I thought this one would draw some humour. But it's a question I've had buzzing round my head for years, and daft though it seems, it must have an answer of sorts - just not that easy to work out. Think I'll have to send this one to QI's tireless elves. It's a pity that the L series has just finished!
Marshwarble, you've just posed a similar question to another one like this which has been in my mind for a long time: Not only 'how far does London go underground', but how far below ground does the jurisdiction of the council or the law reach? And indeed, in the opposite direction - how far above the ground? I'm visualising a cone of influence which tapers all the way to a point at the centre of the earth, and opens out to... well, infinity, I suppose, from the ground upwards into the sky. I guess the edges of the cone above ground would of necessity then have to become a cylinder, as they abutted the cones of neighbouring councils. Otherwise they would overlap badly, and there would be endless wars.
So if you could dig deep enough, or fly up high enough, how far would you go before the authorities would have no claim on you or your activities?