Chris
I have been pulled a number of times by the plod, and have asked the nicer ones the same question.
The answer I have been given is that it is not strictly legal, however as there is no obvious position on which to fix the number plate, and with it being a historic shape, there is no other option.
The example plod gave me was E types etc, they have the same problem, so you should be all right. They said it is obviously better to have one than not at all.
Most of the force live in the real world as opposed to the DVLA who live in cloud cuckoo land.
Robert
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