If I recall correctly the insurance form includes a question about offences and convictions within the past 5 years. I think in principle the insurer could refuse to honour the policy in the event of a claim (and them somehow finding out you had points which you had not declared).

I think you safest bet would be call them, acknowledge the oversight and pay the premium for this years policy and the remainder of policies for the full 5 years. You could go online and get a dummy quote from your insurer both with and without the points to get an idea of what sort of price you might be looking at.

I confess to running the full 5 years with 9 points on a motorcycle licence and never declaring them. I was much younger then, I'd declare points now. In any case have held a clean bike licence for 10 years now having mastered throttle control and having taken the advice of the traffic police officer in the unmarked car which pursued me along the M20 all those years ago. "if you're going to ride at that speed, pay attention to every car you pass". Sound advice.

I got caught by an overhead camera on a motorway bridge doing 81 mph, they must have made a fortune that day for all other cars seemed to be cruising along at that speed. Anyway, the usual fixed penalty and 3 points. I informed my insurer who immediately demanded £70 to continue the policy. This was my first offence for this policy so God knows what a second offence would cost. Needless to say I was not impressed but the thought of invalidating my insurance was worse.

Cheers Concrete