I bought a similar one from Wilkinsons about 2 years ago for about £2.99, thought it was a bargain at the time, testing it out was another story; it was flimsy and really couldnt cut anything, after trying my hardest to cut a branch it fell apart.
Recently got a bahco Laplander off amazon for £14, one of the best pieces of kit I got, its sturdy and looks in place and stays locked unlike the Wilkinson one, it also cuts wood great and worth every penny. Although they may seem like bargains their usually rubbish and fail when you use them which isnt really good when your out and about.