Over twenty years ago, when it cost 50p for P8, down the road from Giants Hole, the cost at Giants was ?2.
Giants Hole used to have a very difficult entance passage involving baling a sump and in the 60's the then owner blasted through the obstructions so that cavers can now get through in 10 minutes what used to take a couple of hours at least.
This was in order to open up the cave as a show cave. But planning permission was not granted for associated buildings so the project was scrapped. Hence the rather larger fee charged as an attempt to recoup the expenses.
Giants Hole has always been a popular cave - for example during the Foot & Mouth epidemic in 2001 when Giants was one of the few Peak caves available, over 65 vehicles were counted there one particular day...
The cave changed owners a few years ago and the new owner still allows access. The owner is not always present so the payment operates on an "homesty box" principle. He does appear now and then and does keep an eye on things.
This is the first increase in many, many years.
Just to put things in perspective.