Just a quick note to say that I passed my upgrade today.
At Warwick, all PhDs register initially for an MPhil, then at the end of their first year (or thereabouts) go through an upgrade process. This involves an interview with two members of staff (not your supervisor) and submission of 10,000 words and some supporting materials. It's essentially an opportunity for the department to make sure the student's on track, and for the student to get feedback from some extra eyes.
Anyway, I passed, so am now officially a PhD candidate! Plenty of work to do on the material I submitted, but for now I'm going to take a well-earned deep breath and relax for a couple of days.....