Idunno.
I think most UK charter operators, (I fly for one) carry approach plates and performance data for pretty well every "suitable" airport in Europe.
Also NOTAMS are supplied with the briefing for all likely diversion airfields on the route.
(Edited to say, I was wondering if this was the same C5 that staged through Glasgow on Thursday on it's way to a destination in Spain. The crew and about a hundred USAF personnel were at the Glasgow Hilton sampling some Scottish hospitality and free fish and chips)
[ 14 October 2001: Message edited by: Bally Heck ]