I had a similar problem last year. I suggest getting it registered, thru a friend or a shop or yourself. Forget about getting insurance in UK. Its quite ridiculously impossible to get one if u are not a UK resident. Just get Green Card insurance from Germany (ADAC- €22 per month), either when u get there or thru a friend in germany or if u dont mind paying extra, through Knoff Tours.
I rode uninsured till Germany, and then got the Green Card Insurance. (Couldnt help it since getting insurance proved difficult and extremely silly, since its a legal requirement to have 3rd party insurance.)Hope it helps. Alternatively You might find a UK company to insure u but u have to pay for a whole year and you are only allowed 2 months coverage in Europe. Expensive and only 2 months coverage for outside UK. Which didnt suit me, as i was only riding the bike a few weeks in UK and needed insurance for Europe.
Good luck and enjoy ur travels