Hi - will be running some HDMI cables into my wall which will be wallpapered and / or plastered over. Theoretically should be able to add more wires in the future if builder does a good job, but just incase I can't, I wanted to run 2 or 3 HDMI cables through the wall. Wire only needs to be 3.5 metres (but that's not such a common size so 4 metres). Question is what's the latest / best spec so I can future proof for 4K and all of its iterations. Bit budget conscious here so looking at ~£10 cables if feasible. Any recommendations for specific wire?