This story (and others) are the subject of the well-reviewed book "A Higher Call: An Incredible True Story of Combat and Chivalry in the War-Torn Skies of World War II" by Adam Makos and Larry Alexander
I believe this was previously the case, but it is now possible to opt out. I flew from Heathrow (Terminal 2) on Friday, refused the mm-wave scanner and had a pat-down in a private room instead.
The only alternative that can be offered to a scanner is a private search which allows for a more extensive hand-search than usual. Passengers will be escorted to a different location in the airport from the main search area (eg a private search room). The private search may involve the loosening and/or removal of clothing. A person undergoing a private search may ask to be accompanied by a witness.
This alternative screening method will take significantly more time than passing through a security scanner.
> Facebook is the internet company that could have passed on information about Adebowale but failed to do so, the Telegraph has learnt.
> The ISC describes the internet firm’s policy of not policing its own website as “unacceptable” and accuses the firm of “providing a safe haven for terrorists”.