A choir of angels shall stream forth from the heavens and amidst harp music and angelic chanting a huge new letter will form in the firmament in fire and the whole of Britain will look upon it and say "what a bloody good idea - we needed a letter like that." And from that day on, Welsh roadsigns will make sense and be pronouncable by the non-Welsh.
Here in Belgium they're planning to turn them around. Now it's AAA-000, then it'll be 000-AAA, so if you're lucky, you can turn your license plate around, and they wouldn't notice. Like this: SSS-086, would become 980-SSS, the speeding begins