Man, that's the price of a decent used car! (25k) It's just shocking. And makes me wonder why? Here in the US ours are just stamped metal with a reflective overlay that has the colors, etc.
From what I recall in the UK when I was there and driving, it was all plastic. A backing plate that reflects with the numbers/letters then a clear plastic cover over that. I just can't fathom why the department of motor vehicles there would charge so much.
Is the whole purpose to deter people from being able to personalized plates?