Its strange how there are now many companies who can supply plates without you having to supply any information nowadays.
In the past, I used to knock up plates at the BMW dealership I worked at, they needed 2 forms of ID, V5 doc, all of which had to be photocopied and kept on file - the actual system (Hills) required you to tick a bunch of boxes confirming you'd seen the information before it would even print the plate.
I was under the impression this was a requirement by law, along with plates displaying the dealer/supplier and the relevant BS info for the plate's reflective material.
The last pair of plates I bought, just had to enter my reg online (could have been any reg), select what info I wanted put on the plate, which could have been none, and they were sent via post without me having to provide any information.
The stick-on one I just bought for the front end came from eBay, is the legal size, spacing and font is standard and is reflective - its like a regular plate, but a sticker - again no information or proof of identity required.
Unless the loophole is they have to be stated as for 'off-road use only' or classed as show plates.
Posting from my phone - excuse spelling mistakes