I did use screwfix a lot some years a go (before Kingfisher bought them out and put up their prices), I've bought a few Forge Steel tools which I believe is their own brand and I have to say they have been rubbish, things like hammers are alright but when a pair of pliers falls apart within a week of buying them then I can't say I would trust their levels, let alone a Laser one.
If it's for the odd job and you don't want to spend the money then Forge Steel are cheap a cheerful but if you are trying to add to you kit then go for quality