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ducting is your friend.
We have just recabled a whole house. Cable is cheap, just put ducts in and throw double the amount of cable you currently need in there, worst case you can just use the cable to pull through better cable if needed...
We spent ages thinking about wheat cables we were going to fit and even ended putting in extra cat6 to run our TV over, with the aim of using HDMI to Cat6 conversion kit.
Ok, fitting cables in runs under dot and dabbed plasterboard, talk to me about it.
I've a phone cable that I want to protect, and ensure that it can be removed/upgraded easily, and some other cabling that needs recovering (as the original cover has come off as the plaster over it was hacked off).
I'm most bothered about the phone cable, as I don't want BT digging plaster out of the wall to repair a faulty cable later, I'd much rather have it safely cased into something so it can be slid out as needed, but I'd also like to do this with Cat6 cables that I'm putting in as new so that if I ever want to re-pull them, it's as easy as possible.