The climb up the spiral staircase is really quite easy and it really is worth the small effort required.

The walkway itself is reasonably wide such that two people can pass, although it means turning slightly sideways, and the walkway goes all the way round. Those people in the distance managed to pass me while I was standing here.

The Victorian roof structure, of which the walkway is part, is interesting and worth at least a cursory examination.

This view is from the walkway looking through the glass in the main hall over the North Wing and Octagon.

This view is from one end of the walkway looking across the tops of some of the trees in the main hall to the far end. There is a person down there in the shade if you can spot them.