Using highbeam through corners (this may get me some flak)

[sinto607276]

Never have to do this as my HID does a grand job on its own :b

And why is it called the "pass switch" there is no such thing in the uk highway code that says flash your lights when "passing" what am I not understanding

Because you should use it when you pull out to overtake. Just before you commit the overtake, you press the pass switch, to show the vehicle your  overtaking your intentions.

Although more commonly used these days to say 'thanks' or 'you go' etc. The flashing of lights, as well as the sounding of the  horn, are defined in the highway code as to show/warn of your presence. And thus if you flashed your lights as you are about to overtake it warns other road users of your presence and is being used in accordance within the highway code.