The regulation referred to gives dispensation when using SWA and a separate earthing conductor. I’m not sure why @Coloumb is trying to take the thread completely off topic. The opening post is clearly referring to “tails” as in single insulated and sheathed conductors, hence the bit where the opening post says about taking them through separate holes. If this is correct and I’m 100% certain this is what the opening poster is intending to do then this is not correct. The Line, neutral and protective conductor need to pass through the same hole so they are collectively surrounded by the ferrous metal.