To be legal, they just need the postcode of the business that made them on the bottom centre. Having "pikey plates ltd" or whatever is optional.
Alloy stamped plates at Dubmeister. I know your Brian isn't a german motor, but I still like them personally. They do legal and show plates.
Personally, Ive made my own front "show plates" when I used to go to shows. The Mini had a smaller front one on (legal one is in the boot, officer), I made it from perspex, with the lettering cut in reverse at a vinyl lettering shop, and stuck some white vinyl over that... I also made some small motorbike plates for my mates this way that were mounted on velcro for obvious reasons.