If my experience of Derbyshire police is anything to go by, you are living on borrowed time with that one.
Ive been done for both my plates, the one on the Golf and the one on the Z. Ive since changed them both to make them look a lot more legal, in fact I think the golf is now 100% legal.
I just got fed up of the £30 fines after the second one.
It did make me chortle a little as Ive seen a coppers land rover (personal car) with a 5 clearly clipped to look like an S. And Ive seen others with sticky tape and bolts used to make words. L19NNC was made to read LIANNE from a distance of about 3 feet. All with the use of black insulating tape!
I firmly beleive its becoming more common for the police to pull people for offences that they know carry a fixed penalty/fine. If there isnt any money in it, they arent bothered imho.
I've been pulled 4 times in both my zeds and never have they done me for my plate