You may qualify for a no claims discount from your insurer if you have been driving for a year or more and haven't made a claim. Most UK companies offer no claims discount in this way. You can sometimes protect this bonus, by buying a protection policy. This may be available when buying find yes van insurance.
Remember when shopping around for a new van insurer that your no claims bonus is moveable; always mention any bonus you may have to your new insurer.
If you've had an accident don't get any repair work done until you have cleared it with your insurance company first. Consider a policy that will get you back on the road ASAP.
Types of modifications that may affect your premiums include: body spoilers, alloy wheels, modified suspension, engine modifications and even sat nav.
Even if you have had a poor quote from a van insurer previously, try them again as sometimes their pricing structures change.