Passed with minor corrections! Can't quite believe it!
It was quite an enjoyable experience in a kind of nervewracking way. The discussion stayed fairly broad and I didn't need to open my thesis at any point, just had to explain certain concepts/decisions I'd made. They want me to do a bit of writing but it's mostly just explaining things that I've assumed people know, and defining a couple of concepts more clearly. No typos at all!
Thanks to everyone on here who has been so supportive and helped me through panics - glowworm, caro, chickpea, cherub, tulip, emmaki, docinsanity, zaorazor, Bilbobaggins (any any others who I've missed, sorry!) you're all awesome! (sorry for the over-exclamating - excited!)