I meant my old socket had a c and an l on it, common and live? Sorry to be dumb but which would the red wire go into and which would the black with red sheath go into?
Looking at the website it seems, is supply to lamp, L in line supply, P is connection to switch, and Cx is either linked to if no neutral or connected to neutral if there is, but you need to check your instructions, as I may have found wrong switch.