I've renewed the insurance on my 2015 V1K today and thought it might be useful to pass on the following in case anyone (like me) is nervous of declaring modifications. I added the following three modifications - cosmetic exhaust change (Scorpion end can), change of rear suspension (Nitron shock) and luggage/panniers fitted. The actual policy is underwritten by Aviva which is commonly used by many of the UK brokers. The result was it made no difference to the price. Screen changes also make no difference.
I was asked if any of the changes made a 5% difference to performance, which of course they don't, so that is also something to be aware of.