No, I haven't. I'll make a point of it in future.
Well worth a visit, I think.
The funny thing is how it appears and disappears completely as you cycle to and from it. You'd think it would be visible from miles around, but it hides.
The view from the top is superb - we think it's about level with the top of the Minster tower, but as it's on a hill, there aren't so many steps to climb to get up there.
(and it's not too far from the NRM, so that's a whole day taken care of!)