[..]
The other option is a torch - prob best to avoid the *obvious* weapon ones with attack bezels... if its bright enough then shining it in someones eyes at night can disorientate them for a second or too... at least gives you a chance to deliver a kick in the nuts... [..]
I've read what seems to me to be a plausible argument that there's a better course of action - go for their knees, not their nuts:
1) Not all attackers are male and the less you have to think, the better. Ideally, you want a thoughtless response because that's faster, and that means one that will work on everyone.
2a) Men generally instinctively protect their balls a lot, more so than other parts of their body
2b) The higher you have to kick, the longer it takes.
2c) From most angles, a man's balls are at least partially protected by his legs.
So if you're aiming for their balls there's a higher chance of missing. A kick on the thigh won't put them down, but it will anger them.
So a kick to the knee, according to this line of argument, has less chance of failure. It should be effective enough because it might well put them in hospital, let alone down on the ground, and even if it doesn't it will almost certainly slow them down enough for you to be able to run faster than them.
Also, kicking a man in the balls might kill him and that might be more force than is reasonable or you want to use.