I have seen a big N+B Clou at the site. We have been several times in our Hymer but that is only 6.5 metres long. Access is via the village of Youlgreave and that is quite narrow but trucks manage it. Coming from Bakewell direction, you pass through Alport then up into Youlgreave where you turn left at the church. Then it gets narrow down to the lower part of the village. My advice is to try and get there between mid-morning and mid-afternoon when residents are at work. In the evening there are more cars parked along the road.
I'll repeat what I said before, do not arrive early. According to the club guide the earliest arrival time is 13.00pm. This is for a good reason, the road to the site is single lane. Max outfit length is 8.5m. If coming from the East Midlands I would suggest the M1 to jct29 then the A617 to Chesterfield and then onto the A619. Follow the signs for Chatsworth, the access road is actually in the village of Baslow, on your left just over a rise in the road past the green. Be careful or you might miss it.
I have been there in a similar vehicle and it can be tight through Youlgreave. While there, I met someone of nervous disposition worrying about their return, which was a shame because it wasn't that difficult. And no signs of anyone not having made it!
Great site for walking. Bit hilly for cycling. Nice pies at the butcher's shop.