Usually a cable has some info stamped on (usually only) 1 side (its a sod to read especially in a dingy loft), an example I have is:
CMK BASEC ELECTRIC CABLE BS 6004 6242Y H 2 x 1 +1mm² 300/500 V CE 2019
hopefully others will say if I'm guessing wrongly, but I imagine it starts with manufacturer...