If you are selling anything at a craft fair or anywhere else for that matter, then you really should have public and product liability. It's been mentioned about tables collapsing but what if the product you sell injures or damages their property. I'll give an example, what if you sold pens and you sold a fountain pen to someone and they came back and said that it's leaked, damaged their Ralph Loren shirt and Armani suit, here's the bill for replacement, or that tealight holder set fire to my house. As it has been said before, there are a lot of where there's a claim there's a blame and no win no fee merchants out there. I do craft fairs and my insurance is with Ian Wallace, it's just under £80 a year. Oh and don't forget it's a deductable expense on your tax return.