Thanks to those of you that have responded to my question.
Wombat, it is not the penetration to the heart that is in question, but to the pacemaker which is I believe just below the skin surface.
Tigertiger, I will try some of the American sites, thanks for that suggestion.
Umi, the reason I am asking these questions is because my friend Jim does not have a computer, so no routers, hubs or laptops involved. I do know that Jim can have great problems with Magnets in close proximity.
Finally, yes thanks Jim is making a good recovery.
Any more constructive thoughts or opinions will be greatfully received.
Alan