Waggon Rut
I think you've missed something on the website. The following is a direct cut & paste:
"Criminal Record Checks for Airside Passes
In April 2003, Disclosure Scotland were asked by the Department for Transport to make the Basic Disclosure Service available to everyone who requires an airside pass at a UK airport. This is in response to new procedures and as the Basic Disclosure is not available anywhere else in the UK at the moment, Disclosure Scotland were happy to accomodate this request. .......... "