Well, on my grey import SRX, I had to get a document from Yamaha proving the bikes year of manufacture... I had to give them chassis number... Yamaha then charged me £60 for a 3 line letter detailing year of manufacture...
Then you get into a chicken/egg situation... you will have to attend a DVLA office with the letter, various documents filled out, and an MOT... the MOT is the problem.... and this bit may have changed now.... but I had to go to a friendly bike MOT garage to get an MOT against the chassis number... THEN... you need insurance.... this too is done against the chassis number ('cos you aint got a number plate yet) and the insurance company (well, mine anyway...) are reluctant to insure against the chassis number.... they graciously covered me for a week!.... luckily by the end of the week I had a number which I forwarded to the insurers....
It's a V62 you need to complete, and it can be done by post, but if you make a cock up, then you'll have stuff going backwards and forwards for bluddy weeks, so best if you can get to a local DVLA office