But if it's locked in the car out of sight you will probably find it's covered by your home contents insurance.
I went to Cape Town earlier in the year and was concerned about the low level of cover for photographic equipment included with most travel insurance companies. I was actually going to take out specialist insurance to cover my kit whilst away when I decided to talk to my home insurer. They confirmed the it would all be covered on my home contents policy and the maximum sum was far more than the figure on the travel insurance policy. Also you have the option, for a small fee, to increase the cover value to reflect the true cost of replacing anything lost or stolen.
The only proviso was that if left in a car it has to be securely locked away out of sight - leaving it on the seat is a definite no-no!