My reading of a lot of the posts on this thread indicate to me that many in aviation know little of the legislation under which they operate, for example Part 5 of the Railways And Transport Safety Act 2003 says, amongst other things:
"This Part extends to the flight and cabin crew of an aircraft, air traffic controllers and licensed aircraft maintenance engineers in the United Kingdom. It also applies to the crew of an aircraft registered in the United Kingdom wherever it may be in the world."
"Section 92 makes it an offence to perform an aviation function or an ancillary activity whilst impaired through alcohol or drugs."
"Section 94 subsections (3), (4), (5) and (6) apply the offences of being either over the limit or unfit, to people preparing to carry out an aviation function or otherwise holding themselves ready to carry out one of those functions by virtue of being on duty or standby."
The ANO only has two short paragraphs referring to alcohol and really only sets the scene, the Railways And Transport Safety Act 2003 is much more explicit, covering alcohol limits, police right of access and much more.