If you're buying a second van your no claims discount only applies to your first commercial vehicle, but you may still get a lower quote if you haven't made a claim.
Although it's cheaper to have third party fire and theft, if you drive a more expensive van make a comprehensive policy may offer more protection for any damage to your vehicle.
Failure to report an accident to your insurer, however minor the accident is, could invalidate your insurance.
Remember any claim made against your insurance company will affect your no claims discount and could lead to higher premiums.