Updating the Tax Book

I sent the Nova rally cars tax book to the DVLNI yesterday so that the engine change can be record and everything can be kept above board and legal. The engine came out of a red Nova I bought years back so I sent a copy of its tax book too to show where I had gotten the engine. That's not one of the methods that the DVLNI list as proof of an engine swap but hopefully it will be good enough, however as they are a large government organisation I don't expect it to be that easy, no doubt it will turn into a whole saga. I hope it doesn't cause too much of a hold up though as I can't get the rally car MOT'ed until the tax book comes back.