Quote From Louisa:
When you say that not all funding councils would support a switch what would that mean? At the end of three years all ESRC money comes to an end doesn't it? - I am not sure about this.
No you're right. There may still be an admin fee charged to post-funding students, that you'd pay I think (I'm expecting my uni to charge me 90 pounds for matriculation in the writing-up year - they haven't yet!), but otherwise it's ended. I was talking more about switching a bit earlier. I considered doing this myself a few years ago, when my supervisor moved. There was no guarantee that my funding council would have approved it. In practice the destination university had regulations barring such a late switch anyway (not as late as yours: I'd have been moving about halfway through the PhD). That last bit could be an issue for you too, especially because you wouldn't be paying hefty tuition fees to them for the rest of your PhD, unless you plan on starting totally afresh (very expensive option without funding).
I have nearly finished. I have done drafts of 8 chapters of 9. Some re-writes needed for first two chaps, but the middle ones are nearly OK. I probably could finish the whole PhD in 6 months, certainly in a year.
That's very encouraging. So you are near the end. Personally I'd try to improve my local supervision, having a frank chat with Sup C and the head of your department, rather than rely on Sup B. I've some experience of a similar situation myself, where my supervisor left for another uni. He was going to carry on as my main sup, but has become more and more distant. Luckily an excellent alternative supervisor stepped in (I appreciate that I'm incredibly lucky with this). So I'd be concerned about how much Sup B will be willing to take on, especially if there are no tuition fees coming into his university for your switching, and thus obligation on him.