i did exactly the same as you when i first passed my test

looking back if im honest would have been much better just starting with my own insurance and gathering my OWN ncb
as when i eventually got a nice car myself and came to insure it i was bent over and dry bumraped !!!!!

you might aswell start earning ncb on shite cars which are cheap to insure until you have your own ncb

as stated in a previous responce and rightly so youve been cheating so far so why should you be entitled to a deduction too!!!