how much is public liability insurance for a small outdoor market stall? would like a rough figure?

i want an actual figure , how much would it be annually? i will be opening in the west midlands, uk. someone i know has an indoor maraketstall which cists them roughly £7.40 per week but thats for aan indoor stall which is more like a shop an its about 4 times the size of the space i will have. i will be selling custom clothes, shoes, accessories, homewear an other knick knacks. any ideas? please give me an figure to goon, ive searched an searched online but cannot find mutch to go on =/