Tried to use a bit of conduit to get from down light to ceiling rose, but no chance as packed with insulation and noggins. Bought Super Rod starter kit and used the light fittings to see end of the rod coming through insulation wool, and got it with a bit of poking. Couldn't have done with out it.
twice the thickness of my old rod kit. which worked ok, but i was feeding a wires through a ceiling space and i could not find the old blue coloured rod. so i switched to the new set and put the LED unit on the front, it was so easy to see the light getting closer to the opening so i could grab it.