I've had a Campingaz one for a few years and just bought a couple of the Halfords version. The Campingaz one is better made with for example a smoother finish to metal edges. I was actually a bit disappointed as I thought they'd be the same model.
Don't mess with gas!
That was in 2016. The author says the fault has since been fixed. That was in Australia though and the Halfords ones sound more like the old style ones that Australia banned!
Can't comment about the folding version, but these, or identical offerings are always £10 or less as a few others have said.
Anybody know if it's possible to swap the gas connection on the Halfords stove for one with a proper screw on regulator?