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Thanks, I hadn't realised that you didn't need to bury the cable at all if you have something solid to fix to. Just out of interest, if it's run in conduit, fixed to the posts, would normal electrical cable suffice?
(that's ethernet in the photo btw, I haven't done a hack job already!)
Polygon-
Ha, don't worry, I didn't think that was a power supply.
I guess you could run it in conduit, but you'd need the conduit to be sealed to prevent water getting in/protected from the elements. Plus installing conduit would be a faff compared to just clipping an armoured cable. What you install in the shed will dictate the cable capacity that you need.
Nef
Depending on the spacing of the posts, running the cable in the air clipped to the posts might be fine, perhaps not needing conduit at all because the cable is armoured, it doesn't need extra mechanical protection. You could also add extra posts - but you'd need to make sure they're properly secure.
Running along that wall in some way would also be fine, but it might lead to complications when you get it repointed. Although I guess you could bang it on the wall and just undo the clips and pull the cable out the way for the work to be completed and then just screw the clips back in the same place (provided the stonework doesn't get moved around in the repointing). I'd probably opt for putting it on the wall one way or another as it'll be cheaper/more straightforward than digging 17m of trench.