I am sure that there are - it struck me that the one you referenced was way wide of the law.
They aren't wide of the law, they are a show plate company so no such laws apply. Only someone buying them and using them on the public highway are breaking any laws.
quote from their website:
"Show registration plates are manufactured and supplied for 'off road'
use only, rally days, car shows, exhibitions and use on private land
where the law does not apply. Due to stringent restrictions of trade
placed upon the 'Company' by the DVLA, all registration plates, legal or
otherwise will be sold to the customer on the basis of being for show
use only and the customer may risk prosecution if the registration
plates are used on the UK highway."
As they always aren't! It seems odd to reference a show site when writing of road legal plates.