I'm not even sure Judith Charmers or Michael Palin are qualified enough to quote the top 10 worst airports in the world? I've found some airports to be totally different for when arriving as a destination or transit pax. Whenever I've flown into NY as a fd pax, no problem - but, when I've flown in as a transit pax, completely different story, hideous experience at both JFK and EWK.
There's no way on gods earth that, ANY, British airport is within the top 10 worst in the world.