With the clocks set to turn back tomorrow, a survey of 2,000 adults reveals a stark generational divide in how Britons cope with the shift to darker evenings.Nearly half of Gen Z and Millennials - 47 per cent - say they experience a noticeable dip in mood when the clocks change, making them more than twice as likely as Baby Boomers to struggle with the transition.By contrast, just 22 per cent of the older generation reported a similar slump.The …