From experience, the cable lovers AND the cable dismissers are generally both wrong.
Cables do make a difference. There I've said it.
However... £274 is too much, and I believe sincerely that you can get the same sound with a tenth of that. It's all to do with electrical properties. So choosing the cable that suits your amp and speakers is most important. Usually I've found that a decent AWG12 to 14 OFC will give you 99% of the performance you can possibly get. And you can get that, well insulated for under a pound a metre. I used some NVA LS3 recently and I *think* there was a performance increase from my standard copper cables, but it was at most, subtle.
But undoubtably, having spent the best part of £300, there will definitely be a perceived improvement. Buyer justification, Expectation bias, placebo, and maybe 1% actual improvement.