So, whats the answer then Robert? We all know that a totally legal UK plate does not fit on the rear of a 240z as it was never designed to go on it. It was always designed for the Jap/US size. You could trim the top and bottom of the plate so it fits in the lower clips and tucks under the number plate light but then its not legal and the top of the lettering is partially obscured. You could not use the lower clips and have it hanging down to the bumper but that really detracts from the lines of the rear. You could get a plate maker to squeeze the lettering a bit but then, as you say, it wont comply to the regulations. I'd be interested to see how you get over these problems on your cars as I'm guessing by your responses that you fully comply with the letter of the law. Any pics?
Also be interested to see others plates or is this the wrong thread for that.