I worked in a paint factory, the boss used to make up his own paint for his house, adding extra varnish and other stuff, so his gloss was blinding. but , to answer the question, we did put different labels on the paint tins, so white gloss would become "white gloss for metal" and " gloss white for woodwork" "deck gloss white" etc. other companies would send us their labels, and we would stick them on. I have tried b&q own range and thought it was rubbish, thin and lethargic. wickes is a builders type retailer, and would think that the quality was reasonable, but not up to the standards of dulux or crown. just depends on what you are painting, is it to be admired, or just a bit of wall or skirting that everybody walks past and ignores?.
don't buy cheapo brushes,buy the best and prepare well and I'm sure wickes will be ample for most applications.