It is clear that there is quite a large void above the chancel vault and below the weather-resisting roof lit by the slitty windows - I imagine there is some fairly hefty timber work there tying the top of the walls together, must see about insinuating myself up there one day

This view of the tower shows how much of the apparently solid masonry is actually broken up into filigree and also shows the ogee arches in their more normal usage. The reduction of weight from the perforations must have helped the lower structure of the tower, but asks a lot of the stone - perhaps why this is the first time I have seen it without scaffolding on one side or other! They say the building costs £6000/day to maintain.