Legality of P-Plate holders over reverse light

[andrewts]

Hellooooo

As my brother is a P-Plater and I am about to become an L-Plater my mum and I decided i would be more practical to use a P/L Plate holder, the type you screw in behind the number plate.

Now in NSW we have the new laws regarding the display of Plates, and how they have to be on the outside of the car, so my brother had used clear packing tape to stick his P-Plate to the outside of the window, the same place as it would have been on the inside. It is fully visible, but being on the back window, it blocks some view. He preaches that it doesn't, but I'm not convinced as can see it in the mirror.

Now we got some P-Plate holders, and they are the type you can bend so they stick out over the rear boot garnish/applique. Problem being with this however, is that it blocks the rear reverse light. The other one works fine, and there is a bit of light coming from the 1cm underneath the P-Plate that is not blocked. It is fine when you are backing, I have looked, the light is just a bit duller on the left.

My brother is a bit cynical and too stubborn to accept that it would be alright, and so he is going to stick his plate back onto the window with tape, which means it is going to leave a mess which is as visible as the damn P-Plate on the back window, and we are going to have to spend a shedload of money on replacing this tape, because I'll have to do 120 hours of driving.

So I was wondering, is there anybody who can direct me to a clause or at least confirm my suspicions that this is legal?