Discovered my car has a hidden accident history - what should I do?

I purchased a Lexus GS 450h from a main dealer about three years ago. The wings are now going rusty and Lexus have said this is due to inconsistent paint thickness from a previous repair and is not covered...

Can I transfer the no claims bonus from a moped to a car?

I'm thinking of getting a moped for my 16-year-old son, putting the insurance in his name so he gets a year's no claims towards his car insurance at 17. Would this work?

Can an insurance company sue me because I gave the other driver a false name and address?

Can an insurance company sue me because I was at fault for an accident and gave the other driver a false name and address?

Lexus GS (2005 - 2012)

Very refined and quiet. Effortless performance from all engines. Hybrid GS450h is superbly refined. Stuffed with technology and equipment. Excellent crash test rating.