BBC and ITV will shutter Standard Definition (SD) broadcasts for Sky TV and Freesat viewers within hours. The shake-up is designed to improve the viewing experience for millions nationwide, with High Definition (HD) offering a dramatic step-up in picture quality. But the move away from Standard Definition will leave some viewers with ageing Sky TV and Freesat kit without access to live channels from ITV and BBC. If you’re one of the unlucky few, you’ll need to upgrade to newer hardware before you’re able to continue watching these channels. “To avoid losing channels, we strongly recommend that…