For 2-3 years now I’ve had classic car insurance which doesn’t use any NCB.
I’ve now tried to get a normal policy and have been told that my 9yrs NCB from before I started my classic car policy has expired and effectively I have 0 NCB - even though I’ve never made a claim.
My brother just returned from living abroad for 4 years & had the same problem…no continuity of policy therefore NCB had lapsed.
He contacted the insurance company that he had been with prior to this & they gave him a 40% NCB after verifying his claims history. This was Prudential, but assume other co’s may have a similar policy.