seriously doubt porsche uk owns the plate,,RUF are an independent company who register vehicles under their own Vin numbers, as well as modifying existing Porsche registered cars. the UK arm based in Surrey disappeared a few years ago.
Not really an advert, but if it's naughty, someone remove it But I think a mate is still trying to sell his Porsche number plate it's P666CHE (I think) it's going quite cheap drop me a email if anyones interested