TikkiRo - UK CAA have just issued amendment to ANO which prohibits any passenger from sitting in jumpseat or even visiting flight deck. Only exceptions are immediate family of crew or company personnel. Maybe you could contact them to arrange special dispensation.
Hoverman - you perhaps never heard about Fedex flight engineer who attacked crew with a hammer while taking jumpseat ride. Heard his plan was to fly into fedex HQ to pay them back for sacking him. Not sure about all the details.
[ 21 September 2001: Message edited by: Matt Vinyl ]