I suspect they mean 18 years since a claim.
As you say most insurers cap at 9 or 10 years, however after 5 its generally only 1% for each additional year and after a claim you go to 3 years anyway. As alluded to protected NCB can have so many caveats it is questionable whether its worth having.
My only recent claim was found 100% the other persons fault, but still resulted in a renewal quote twice what I'd paid the year before.
However as the insurance market is so competitive I shopped around and found cover at a similar price with a no fault claim to report.
My last fault claim was years ago and due to a hit and run. It resulted in my NCB reduce to 3 years, but I still found cover cheaper than I had paid the year before with 5 years and no claims!
You just have to shop around and find the bext deal in the market at the time you need cover. Getting quotes now could be meaningless as there is little logic to insurance!
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