Hi BobbyBobBob
I dont think Eddie51 is correct in this instance - your insurance company, Admiral, will not be able to repudiate a claim due to the fact you have not declared enough bonus! Insurance companies can only refuse claims where there has been deliberate non-disclosure of a material fact which would affect the insurers decision to take on your insurance policy. You do not have to worry about non-payment of a claim in this instance i assure you!
Basically, just send in your proof of no claims to admiral, they will apply the relevant additional discount (prorata'd) and then possibly charge you an admin. However, ensure you do this as you will lose your extra year if you dont!!
I hope this is of some help :)