While I was shooting this, I was joking that it was a crapshoot. Because as awesome as long exposures of fireworks are, they are really essentially, press a button, and then wait and hope and see what you get.
With these basic tips, it should pretty much be happy shooting!
Some tips for those who want to attempt shooting long exposures of fireworks
1) Get a tripod, as without one, you won't be able to keep the camera stable enough for the long exposures
2) Set the white balance to daylight, or colour temperature to about 5600K. I learnt that this allows colours to be recorded in the camera as they are, rather than having the camera compensate for what it thinks your eye is comfortable with. Usually, for night shoots, this will mean that colours become more muted or colder, and of course you don't want that for fireworks
3) Shoot at F-stop 11-16, with an exposure of 3-5 seconds. Here, the length of exposure is the key, as you want to shoot with shorter exposures so you get more variation in firework patterns
With these basic tips, it should pretty much be happy shooting!