oil, antifreeze and spare bulbs would be good too.
Antifreeze = coolant (in most cases). Got that.
Oil - good idea, except I have no idea what oil it's got at the moment.
In a diesel I would also carry an extinguisher with CO2 in it in case you are unfortunate enough to end up with a runaway engine.
Got one. But I guess it is more use with petrol engines.
Jumpleads would be good, maybe even a spare battery.
Might get that eventually, so far I have enjoyed the chat with AA
A tire pump in case you got a slow puncture.
Got that
I personally wouldn't be without a pair of polarised sunglasses as my eyes are very sensitive and they work wonders in cutting through the winter sun glare.
Maybe, I just don't enjoy losing 2 stops of light
, and with polarised ones it doesn't take long till you can't see LCDs.
torch and/or lantern, the latter would be useful if you got caught or stuck and needed light, save draining the car battery.
Andorid has now a very useful Torch app. Priceless.
pocket heaters, gloves and hat for the same reason as above.
obviously some of the above would probably only be necessary in winter and on long drives, but it's good to be prepared...