I updated our Tribute 715 for free, after contacting Autotrail they sent me FOC the relevant documents and new PLATE I then filled in the appropriate form for advising the DVLA of changes and sent it off, All this cost nothing and once the registration document was returned all I had to do was fit the the plating certificate. There are also companies that will do it for but they do charge. From I gather it’s the same procedure to revert back to,original. Hope this helps.