Spent most of yesterday in my attic, clambering across joists which had not been boarded. Knee pads were essential. The joists are close together which made it easier. Unfortunately the rafters are also close together. I had to turn sideways to squeeze through the rafters in this photograph, to get to the unboarded area.
The old skills learnt in my university rock climbing club suddenly became useful. I remembered to be gentle in my grip and strong in my expletives!