I'm thinking it's a fake story. I Google'd it as much as possible and came up with nothing..Not to say it isn't out there on the net, but I'm usually pretty good at hunting things down. It's how I debate all the time. :p
No mention anywhere of anything happening like this in the US unless things are being kept on the down lo. However, for the UK to hear about it, I would think it would have to make national news or at least bump around a few websites online for anyone to pick it up. I realize we are all really connected way more then we've ever been in life...but ain't THAT connected.
Either way, ultimately it's a cool idea. I do think, though, that hygiene and cleanliness might be a problem. (*shudders* the exercise bike seat alone) However, if all handled correctly, I don't for see it being a huge issue. Only been to one nudist resort, and they didn't have anything like this. Does make me wonder if larger, or more well known, resorts do.