You can't opt-out of the full body scanners at Heathrow and Manchester now. That means, if they select you, you have to give someone you can't see a good look at your naked body. It's only a matter of time before someone gets sacked for posting those pictures online. Remember, the person watching the scanner is a £10/hour security droid - not exactly the most trustworthy demographic.
One to think about if you've got children. We Brits seem paranoid enough about paedophiles and perverts - now you've got Government sanctioned one.
This was a joke. Not so much any more, eh?