I got mine off the bay:
There is a BSAU marking in the bottom right hand side.
Interestingly, where the UK postcode + plate suppliers name usually is, it has PL8S DUBLIN 1 !
Bit of a grey area to define the legality on these, I think they call it a technicality, either way, these plates won't draw as much (if any) attention to our friends in blue if you compared them to the German fonts that you tend to see on the VAGS.
Costs are on the bay, £19.99+£3.99 postage.
Thoughts on attaching to the car. Not really sure about drilling a hole in to it, perhaps maybe some sticky pads. Alternatively thinking about a number plate holder too.
Cheers