On Tue, 08 Nov 2005 19:40:15 GMT, "Graham J"
wrote:

What would happen if you refused to be checked? If you told them you just
entered from the surface, and were leaving on another exit?

Well if they'd just seen you pass through the exit gates or you emerged from
a direction where there were only exit gates then I should imagine they'd be
disinclined to believe you. As far as I am aware you don't actually have to
be caught in the act of breaching the bye-laws, only for it to be reasonable
to believe that you have done so.

And no doubt they have CCTV covering the whole area, should it come
down to that.