The hourly Woking to Farnborough route used to run through two army camps, over restricted roads between them.
Buses heading west (from Woking towards Farnborough) would enter Pirbright Camp and get searched by soldiers inside, outside and underneath with a mirror on a stick. Buses would then continue through the camp and along the internal MOD roads over the shooting ranges to Deepcut Barracks. There, they'd get a second (sometimes slightly less in-depth because they knew you'd have been checked at Pirbright) checking over. The reverse would happen in the opposite direction - full check as you enter Deepcut Barracks, and your second check as you passed through Pirbright Camp. This arrangement lasted through the Alder Valley days into the Guildford & West Surrey (London & Country) era of the 1990s. It changed during that latter period though, to be diverted via publicly accessible roads which increased the journey somewhat. I'm not sure if there was a particular event that caused it, or just toughening up of security measures.
One incident did occur shortly before the change in the 1990s though. Upon arrival at Farnborough, drivers were supposed to double check their buses for any left items before heading back towards Woking. The length of time the two searches took varied depending on how keen the soldiers on duty were that day, plus also the hourly service made them a handy tool for training purposes which obviously made the process even slower. This often meant you arrived into Farnborough late and sometimes had virtually no layover anyway, particularly if you needed to nip into the shopping centre to use the loo! On this particular day, the driver didn't check the bus on their layover in Farnborough town centre and set off back towards Woking. Upon arrival at Deepcut they were searched, and let through. At the second checkpoint though, an unattended bag was found on the back seat. Because the driver hadn't checked the bus, they couldn't be certain if it had been left by someone on the previous journey, or by someone getting off earlier on during the current journey. As a result the army took no chances. Whether it was really necessary or just wanting to prove a point, the army decided to get their robot out. They blew out the rear window so the robotic's arm could reach in an retieve the bag, and the bus driver taken into the camp to be interviewed. As it turned out it was just innocent lost property though - a squaddie's belongings, including a reasonably-sized stash of naughty magazines!
I've knocked up a quick map attached. Blue hash markings show army land - the top is the restricted access land mentioned above.
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Red line (7.5 miles) is the old route through both camps and along the restricted roads.
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Yellow line (9.3 miles) is the revised route, showing that Pirbright Camp became a 'double run', with buses doing a three-point turn (or just about in one go in a Mini Pointer Dart!) at Slade Road.
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Green line (10.8 miles) is a later routing after a bridge over the railway near Deepcut used on the original yellow diversionary route had a weight restriction put on it. This increased time even more as it meant an even longer double run via Frimley Green was required to serve Deepcut.
Today, the route is White Bus' 48, with just one return trip per day running west of Pirbright Camp (as per green route to the main road past Deepcut, but then staying on that and running northwards off the map to Frimley Park Hospital, instead of retracing its steps back to Frimley Green and then Farnborough).
