Not sure you can trust Which? here unfortunately. Anybody doing a study who stays tight lipped on the methodology, well, then it's not a study at all, because it cannot be repeated by independent people to verify the findings, and neither can it be picked apart, after being found that they had youtube running in the background or something stupid... All this is, is someone saying something. Fat lot of good someone saying something is. If simply saying stuff was valid, then maybe CNN, Buzzfeed and The Verge might actually be relevant in today's world lol.