Welllllll.... according to the RTA website....
What special rules must I follow?
P2 licence holders must:
Have P plates (green P on a white background) displayed conspicuously at the front and rear of the car when driving. If placing P signs on windows, they must be held against the glass, be displayed conspicuously in lower left-hand (passenger) side of the windscreen and on the lower left-hand side of the rear facing window and must not be placed on any other part of the window area. If towing a trailer, a P plate must be on the back of the trailer.
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Failure to comply with any of the above requirements is an offence and carries heavy penalties, including loss of licence.
However, on the full licenced page, it says nothing about plates..