Finally got some flooring finished off. It's taken an age, trying to get it cut to fit the slightly imperfect shape, then getting it stained, then screwing it down only to find the joists weren't quite as even as I first thought and having to lift it to perform some surgery on the support, then finding it still wasn't quite right because the ends were a bit wonky and getting shims underneath, to finally having it screwed down and looking good.
Now I have a solid floor again I can get my ladder in there and finish studding a section of wall and fixing up the ceiling. I'll probably put a tarp down to protect the new floor - ideally I'd have done the ladder and framing work first but I can't use a ladder without solid floor, and I needed to lift the floor to finish a previous piece of work, so my hand is kinda forced here.