went to a job last week involving removing heater from a wall in upstairs bedroom, anyway while onsite the home owner asked me if i could replace the cable linking the 2 shed light because it had been chewed through by a rat or mouse so took a look and said id put a price in the next day, anyway if you look at all the areas that are in conduit now, that was just cable clipped to the wall i though it better/safer to be installed in conduit than clip direct to the walls, also the light fiiting was 1 x strip light with a pinkish type lamp, and a batten holder, but the walls looked/felt damp so priced also to install 2 x sealed weatherproof fittings, now all wiring is in conduit, only took a couple of hours. thought youd like to see anyway