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Guaranteed not to hit any wires or pipes... there are none up there.
I'll buy some conduit pipe like https://www.screwfix.com/p/tower-conduit-heavy-gauge-20mm-x-3m-length-white/6282p and will run it behind the TV and book cases containing the cables... drill a 2cm diameter hole, poke it through the insulation in the loft... repeat at the other end. When done, use hot glue to cap off the loft end so it's not a chimney.
Velocio
I did a similar thing at my parents' house a few years ago but just had to go directly through the ceiling to the floor above. No conduit so used some dowel to guide the cable. Really straight forward assuming you know you're not hitting any other wiring or pipework.