I didn't start this until very late, because the newsagent didn't deliver the Guardian for some reason, and by the time I got hold of one I had to go out. However, when I did start, I finished it remarkably quickly. I found it unusually easy for Paul, and was surprised to see others have the opposite experience. The only thing I couldn't figure out was where the second letter of 9d comes from, but someone on this forum cleared that up.