On 24/11/2016 15:03, www.GymRatZ.co.uk wrote:

If 'twere my shed I'd have screwed the ceiling rose thing onto the side
of the joist and modified it with a pair of side cutters or hack-saw to
allow cable entry from side/top rather than the strange over-sized bit
of wood "bodge" but yes, twice as many clips as a back-up to not having
a roll of mini trunking in the van.

Or.... just drilled through the joist/rafter thing and run the cables
along the back-side.