Today I learned something somewhat shocking. A policy which I believed was some kind of controversial fringe policy from way back in the days of Vista is still in place, and it's in place right here in the UK. Currys/PC World is totally overzealous with its GNU/Linux-hostile policy, which is almost definitely dictated by non-technical management, maybe in collusion with Microsoft.

[...] an old desktop of mine died on me and I sought a replacement immediately (within the hour). [...] Currys pretty much devoured the competition [...and] has an outrageous policy regarding warranty.

As it turns out--and this was confirmed to us by multiple people (in multiple PC World stores) after arguing for more than half an hour--once you install GNU/Linux (even if it's dual boot with Windows) no damage to hardware would be covered by the warranty (keyboard, screen, and so on). One of the sellers, who follows the Linux Action Show, regretted this but also defended this policy because it's imposed from above.

No matter how ridiculous a policy it is, changes to [zeros] and ones on the hard-drive (to remove spyware), according to Currys, would void the warranty on what clearly is not connected to [the pre-installed] software. [...] we decided we just couldn't do business at PC World. The company is inherently GNU/Linux-hostile. Avoid Currys.