No worries, I plan on lifting the car this weekend to check for any rust and other issues anyway so checking under the bumper sounds like an easy thing to check.
I was unaware just engaging reverse with the engine not running would work, will test that and get my multimeter out.
Yeah foglights are the weird one, I turned them on and can see the light on the dash light up but nothing changes at the back of the car. Fronts work fine but when flicking on the rears nothing seems to change.