Just a few points to mention:
1. If you have an utter chav mobile, a horrendously loud exhaust, or drive like a hooligan, then the police are very likely to take any opportunity to pick you up on anything. Since everyone HAS to have a numberplate, I see little point in trying to make them look cool in anyway, as they're never going to. Far better to just have something that is 100% compliant in every way with zero personalisation (including dodgy spacing and fonts), at least that way you have far less chance of getting hassle.
2. On the flip side, if your car is fairly sedate and you don't hoon, then you're much more likely to get away with not having the BS number at the bottom, with perhaps some other text. Much like speeding, if you're in a silver Mondeo you're less likely to get pulled than if you're in a red Ferrari.
3. Running without a plate is a lesser punishment than if you intentionally run a dodgy one. Obviously you can only use the "Oh, I didn't realise it'd fallen off officer!" once, but hey, worth a punt the once. I may have run the VXR220 for over a year without a front plate...