Thanks a lot buddy.
That is an extensive list! I have decided to start off by swapping out the RAM that I have from another pc and also checking all the cables. After doing so I noticed...that there are noises in the title sequences of Far Cry 4 that weren't there before?!?!? It is possible that they patched it very recently, but perhaps this could indicate some problem with the old RAM!? Apologies if this is completely irrelevant.
Anyway, I had three BSODs during normal operation today (from zero over the previous week- i.e. the problem is quickly getting worse) so I should be able to tell pretty soon if the new RAM is making a difference.
Thanks again for your help. If you don't mind me asking, what do you get out of helping strangers on the internet? I am glad that people like you exist, but I must admit I'm not sure why you spend your free time doing this! Maybe I'm just a selfish dick! Regardless, it is much appreciated!