You have to ask yourself if its worth it.
Every time you pass a police car you'll look if hes coming after you, if there is a police car in front you'll be sh****g yourself incase he spots it in his mirror and if you park it anywere and its spotted?
You say you live in the West Midlands. Two Scooby lads were pulled on the M42 after a track day at Donnington last month, both were fined for having small plates. They both had new Sti8's and were not breaking any other law, the police said control had seen them on the cctv system.