Safety Devices / Anti-Theft Components
Most insurers will provide discounted premiums if certain safety devices or anti-theft measures are installed in the car. Car owners however have to be 100% certain that the insurer will recognize the type and brand of safety device before actually installing it. Some safety devices or anti-theft components might not be recognized by the insurer and you would be wasting money fitting them.

Anti-Theft Devices
Installing anti-theft devices lowers your risk profile which means that your premiums will go down as a result. It is however very important that you get a list of your insurer's recommended anti-theft or alarm systems, each system would have a "point" associated with it refering to how each product will affect your risk levels. Never buy a product that isn't recommended by your insurer, you will have a hard time trying to tell your insurer that the product is worth a reduction in premiums.

Always Reviewing your Policy at Renewal Time
Markets always change and your personal circumstances always change. It is always prudent to review your policy every time the renewal date comes. Always get some other quotes from other insurer and compare it to your to find if suddenly you are paying too much for your car insurance.

Discounts for Multiple Policies
Almost all insurers offer a discount if you hold multiple policies with them. This insentive however must be made known to the insurer before you actually receive the discount. If you find an insurer that can give you reasonably good rates for other assets such as your house, it might be worth it to move the insurance policies over so you can get a further discount.

Discounts Brokers
With the internet, many discount brokers finally have an avenue to service the wider public without actually setting up shop thus lowering their levels of overhead. These discount brokers often search for the best insurance deals and present them to you at very reasonable costs.