We went down to Cornwall earlier this year, got about half way after around 3 hours and the bottom of my back/top of my backside was sore. Stopped for a while and it eased but it was sore again after the next run. It was the first time since getting the van that I drove any real distance, the van had done around 53k miles when I got it. If nobody else has had a similar experience then I guess it could be the seat position but it feels more like there’s not enough cushion for my 14st backside! I don’t really want to change the seat cushion and find it doesn’t solve the problem.