Firstfix Networks

Building control generally won't blink at Cat6a — it's not part of the notifiable electrical work, so as above, your sparky's certs cover the install. The bit worth getting right is the bundling itself: use velcro/hook-and-loop, not zip ties — zip ties cinched tight enough to tidy 17 cables will crush the twisted pairs underneath and can knock out your Cat6a headroom. Loose figure-8 bundles, supported every 30-40cm, with a bit of service loop left at the cabinet end so you're not re-terminating if anything needs moving later. Worth labelling each run at both ends before it disappears into the wall too — it's the single biggest time-saver when you're patching it all in months later and can't remember which bedroom is which. (Disclosure: I run Firstfix Networks, fixed-fee remote planning for exactly this stage — not pitching it here, just flagging in case it's relevant to anyone reading this later.)