Sorry, never tried them so I have no opinion, often stuff found at screwfix and tool station are not the best so I would treat with caution as a first response, however I do know they do also sell some good stuff so that doesn`t necessarily put me off but give my first instinct a question mark as a starter for ten.
I started ordering from Screwfix many years ago when they were only via post and only selling screws etc, no problems.
Then they started selling in their own outlets and more stuff too, not all of that was good though, but some was ok.
Tool station came around later and was OK but I prefer screwfix.
Stuff that I already know i am happy with but of the two I often use Tool Station if possible because 1) I live nearer to local one and 2) my Wife`s work is nearby so when I drop her off its only two mins to go there.
Things like a "Workmate" thing I have bought a few of the cheapo ones from those two over the years -for my small use they are handy and light so do the job, however if I was in a trade such as a joiner etc then it would have been so but I think both of these companies might sell some of the better ones now - its a horses courses.
I know of some that will not buy from Screwfix just because it is Screwfix and I think that is a bit silly and probably similar things happen with Tool Station.
So John, for your own use I would approach a suck it and see, when I was trading I would only use things I had tried and tested over the years and then secondly usually who had the best price or delivery if it was important or who had the best service.
But from that brand you mention, sorry I can`t be much help.
Volex is one brand I would never buy, if they exist nowadays, their ceiling rose, for yonks, was a strip connector with a cheap base and cover, they were popular in some parts but not to me Ugh!