Sorry mate, 6 points coming your way, IN10 and be prepared for people to refuse to insure you. You could possibly have a fine to of at least £250.
I know this because 6 years ago i drove my dads car as you under the impression i was insured as i insured 2 vehicles fully comp in my name and thought i was covered. I got the points and the annoying refusals!
Sorry bud, just the way it goes. But has taught me a lesson, i will never drive anyones vehicles, not even sit in their seat.