Some people like to bring a rope to use as a handline on the incline, but well, that's a lot of lugging for not much of a necessity I'd say.
Good old Cwm has plenty of potential for some rigorous SRT work btw! More mines do (Hafna, Parc, just to name a few) but Cwm is nice and dry and allows people to walk from top of pitch to bottom, which makes it nicer for people not actually on a rope, if you see what I mean.