> The Road Traffic Act does not apply airside.
How so? Not a "public place"?
What about the Transport and works act 1992?...
http://www.cps.org.uk/cpsfile.asp?id=693
"Police officer may enter any premises where
person believed to be found who works on public
transport, to administer breath test after accident
in which injury believed to have occurred; may
also enter to arrest on suspicion of being over
alcohol limit, or for failure to provide a sample"