Yup, I have Special Access which I paid for and they refused me entrance because one of my group was in a wheelchair and might damage the ground.
I tried to point out that the center of the circle was concreted and turfted over in the 60's but to no avail.
No access and no refunds!
A week later hundreds of people were allowed in at winter solstice and churned up the grass with no charge!
PeteG