Machine Mart, Ebay, Most tool shops......halfrauds are a waste of time for most things anyway. Only go there if it's a sunday, and everywhere else is shut and you really have nowhere else to go!!!!!
Halfords professional range of tools are very highly regarded. Superb quality, good guarantee and a fraction of the price of facom or snap on.
They may well do a 'professional' range, but i very much doubt any professional mechanics would go anywhere near the stuff. Snap-on if you can afford it.
My beef with Halfords is everytime i go in my local one, the shelves are never fully stocked, and if you can find what you want, it is overpriced when you compare it to my local small independant car parts supplier.
Plus the staff are usually next to no use at all and really don't want to help or even be there.
Halfords is ok if you want to buy a cheapo bike or a roof box or maybe at a push a stereo, but for 'proper' tools....naaaa. In my opinion of course.
If you use your tools all the time and want them to last you a lifetime invest in good stuff....if you're just using tools occasionally for light work then anything in theory will do.