I could have been clearer. Such UK retail purchases are guaranteed for 6 years. So the point I'm making was that it was beyond 6 years before any of my 20 x 2015 mbp's failed in any aspect. The 4 x M1s had poor battery cycle count, very early on, and subsequently became unreliable when not powered. I use them in the office. I should add there would be a significant investment hurdle in new peripherals to move to the 'new' usb-c standard, hence holding on to the 2015 model. It's been nothing short of the most versatile laptop I've ever worked with. But it's time is almost up.