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you running it up cavity or just straight through, inside to outside?
 
Personally, I would avoid running cables in cavities if at all possible. If it becomes damaged from contact with a cavity tie, you might not see it.

If you must, wouldn’t some sort of flexible plastic conduit be better?
 
Just been looking at regs for this. Using flexible conduit should provide strain relief and a compliant bend at the top cavity point of entry - that's where most of the mechanical stress would be (reg 522.8.4 and .5). It would also provide protection from falling debris (reg 522.6.2).
 
Dont like it.

Anything in a cavity that shouldn't be there has the, very real, potential to bridge and cause damp.

Agree. Never a good idea. And there's the risk of someone drilling through the wall and not having any clue that it's there.
 

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