Which Ethernet cable category (Cat6 etc.) for home use?

Maybe try untangling everything, separating the ethernet from the power cables before splashing out. EMI can occur when cables are bundled up.
CAT6 seems to be best for minimizing interference.

For that kind of length just regular cat6 will be fine for 10Gb (hell, even 5e should work)
Not sure if I'd worry about 10Gb too much now, though. Home kit seems to be moving more towards 2.5Gb these days as the new standard rather than the more expensive and hotter running 10Gb. I'd be surprised if the next consoles use 10Gb over 2.5 for example.
Plus you can always just replace the cables if really needed. I'd worry more about cable spec if you're buying it for a proper cable run.

Depending on where you are you might have more luck searching for FTP instead of STP btw.

Thanks everybody. I wiggled them many times, to no avail. On Apple TV, it's no problem aside from the error message that shows up, as the dropouts are shorter than the stream cache. But when playing Destiny, it's really annoying. Will get a few Cat6 S/FTP cables, they're available for a few quid.

How do you mean?

Well, why not, I already have a tinfoil hat.

Yeah if they're bundled up like that then get cat 6 and above, they have much better shielding than 5e.

Then in addition to better shielding cat 7 and 8 are also wound tighter which gives a better construction and further reduces noise and EM cross talk.

They transfer data at higher speeds which is good for gaming. And better shielding= better and more consistent speed as well.

Something to consider is that 5e especially is kind of obsolete now, if you're buying new cables you might want to consider upgrading despite lower cats being cheap as chips.

Something else to bear in mind is that the cable market is swamped with cheap knock offs, so beware of it says it's cat 7, if it's really cheap it might not be.

I know by the time it really becomes an issue that home WiFi will be so advanced we probably won't need cables, but consider future proofing yourself and buying better ethernet cables. The leap from cat 6 to cat 7 is huge in terms of quality construction and data transfer rate. I have cat 8 cables for gaming, which are a big leap again and very future proof.

But they do get pricey so hey, pick what you're comfortable with. But this isn't like snake oil hdmi cables, the industry standards between cat cables are real and quantitative.

What about wiring a house up for data?
We're doing a major renovation and have the opportunity to put in whatever kind of data network we want. Is it just a case of 'whatever we can afford'? Or is there a point of diminishing returns? I didn't even knkw there was a cat7 or cat8 so the ignorance level is pretty high.

Aren't Cat7 cables be very stiff and because of that a pain to use in tight spaces?

Yes. If you have well-sized tubes without sharp angles, maybe use Cat 7 for future proofing, otherwise Cat 6a will probably work better. Cat 7 is also a pain to terminate on the connectors/sockets.

This is super, thanks.

Yeah, it's a forever home and is sucha deep renovation it's like a new build. Love the idea of fibre just sitting there waiting for it's time to shine. I can't think of what could possibly need that in a home but I'm not good at future-guessing.