Does your iPhone screen have a yellow tint? This could be because a feature called Night Shift is turned on, but if your handset is one of the iPhone 12 series it may well be part of a wider problem.

Last November, Robert McGovern bought a 27-inch iMac equipped with a quad-core Core i7 processor. When it arrived 12 days later, McGovern, a British citizen living in Germany, happily went about ...