Never trade without insurance!
As tempting as it may be, its just not worth the risk.
Insurance is a must have in todays market place and I doubt any market would actually let you trade without insurance anyway, but if you did find one and thought you could save a few pennies, save it on something else.
Not only are you insuring yourself and your stock but should somebody have an accident in your stall, or get hurt or sick from your stock you are also covered.
Unfortunately accidents do happen, and as rare as they might be, if your covered, you wont need to worry about a law suit on top of everything else.
We have a list of insurance providers, but it is important to shop around and find a policy that suites your needs, not just a generic policy, but one that suites you. And of course check them all out and compare pricing, its a competitive market and you should be able to get a very good deal if you go about it the right way, an hour on the phone could save you a lot of money.
Bottom line, insurance is not expensive, and if you average it out over a year, you should only be paying a few pounds a week for peace of mind.