If you were asked to conjure an image of a typical Guinness drinker you might picture an elderly flat-cap-wearing gentleman or a rowdy rugby lad. But in an unlikely turn of events, times have changed.

But it has led to concern among pubs and bars this winter, with some saying the cap could leave them with far less Guinness than their customers demand. For Irish pub chain Katie O'Brien's ...

These are all good problems to have independently. But together, they’ve left Diageo with a short supply of Guinness at a busy time of year. The London-headquartered company will impose a weekly cap ...