I think I have gleaned sufficiently from other posts that it is acceptable to use good quality inline crimps to extend cables for terminatingwithin a newly installed CU. Invariably,for 2.5mm T&E and 1.5mm T&E these crimps will be red in colour. I ask the experienced electricians on this forum: is it best to cover the crimp with suitably coloured insulating tape or left as it is?