Did mine with a (large) hacksaw and file to round the corners off and make sure the reflective backing wasn't coming loose. I just chopped the ends off, maintaining the same space between the edges of the letters and the edge of the plate, it must be 11mm minimum as per the
regulations and you shouldn't get pulled over. The back plate needs renewing (plastic bolt head missing, "coachworks" name shown on bottom) and was going to get a trimmed down plate on the back too, but not sure if it would look too naff?