Allow the space to be moved so it shows the name/word, which is the reason the personalised number plate would have been purchased in the first place.
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So long as police ANPR systems can still read the number plates and pick up the vehicle details, I don't see why they can't be spaced to actually show the name. As long as there isn't any illegal bits done, such as adding a dot between 11 to make a H, or shortening the top of a 7 to make an I, then it should be allowed.