This website exists mostly to host various maths-related bits and bobs that are of use to others. As I move so too may the website, but the address cnewstead.co.uk will redirect here.
Topos Theory. Fellow masochists doing the Part III Topos Theory course can find the course web page here.
Notes. I am maintaining a few sets of lecture notes and revision notes, which can be found below — please let me know if you find any mistakes. Source code is available here and is released under the Creative Commons Attribution-ShareAlike 3.0 Unported License.
Lecture lists. After spending hours digging through the Reporter to find out who set the exams for my courses in previous years, I have uploaded all the lecture lists for Parts IA–III of the Mathematical Tripos from 1998-99 until 2012-13 in a zip file here (Raven login needed).
A list of past and upcoming talks I've given can be found here.