Nice Pink Pigs, Mightygem, don't work for Zurich do you? ..and Helinut, I agree about the wires but that would cost money - making other people draw circles on maps is much cheaper... Won't work.. but MUCH cheaper!
Incidentally, I had Gloucester prison "shop" me to the local Special Branch who tried to give me a one-way interview without coffee about infringeing their exclusion zone! ..Er, what exclusion zone would that be then, officer?
A bit like the non-existent Parkhurst one, I suspect!