Some good advice on here.
Given I work in the insurance industry (not cars before anyone asks! Lol), I would point out one other important issue.
By declaring all of your mods to the insurer, they should be able to increase the value of your car to compensate for the mods. So if you have £2K worth of alloys on your Zed (BBS etc), then some of that value can be incorporated into the overall value (will depend on the company, but factor maybe 50% of the value for most things).
Yes you will end up paying a higher premium, but at least you won't lose out completely if the worst should happen, and some tea leaf pinches your pride and joy
The number of people who have spent more on mods than the car itself, who then have it stolen and get nothing back (apart from the value of the stock car) is suprisingly high.
Minor mods like stickers etc shouldn't increase your premiums, but by declaring them to the insurer, you are in a far better position should something happen.
Post codes and whether you have off-road parking/garage, CAT 1 alarm and immobiliser all play a part in what you will be quoted.
Final word is be clear and totally upfront with the insurer/broker. Last thing you want is to be told your not covered due to non-disclosure of a material fact, when you're already hurting from losing or having your pride and joy in a prang.
Final, final thing: Always read through your certificate and make sure everything is as you described. The certificate itself isn't normally more than a couple of pages, but it's time well spent.
Hope this helps.
