Congratulations.
Regarding insurance, I would shop around a bit more before committing to the Carol Nash offer – you already know what they will charge if you try in amending the policy later. You might find it worthwhile going with a new broker than adding your other bikes when their cover lapses. I would certainly try Footman James, Peter James and Bennetts for starters (the latter is now owned by Saga and you are in their age range!). However if you look in any of the motorcycle mags or Google bike Ins you will find plenty of choice. If you do find a good deal let everyone know as new players do come to market from time to time. Remember to ask not just for the premium but what their minimum charges are for policy amendments.
Peter