Costa's profitability turnaround is real, but it's not just about following trends - the cold drink pivot actually solves a structural problem they had. The previous answers nailed the margin and competition angles, but there's something else: cold drinks have way longer shelf life and less waste than hot beverages. A cappuccino sits there getting gross, but an iced latte can sit in a fridge for hours. That matters more than people think when you're running hundreds of locations with variable traffic.
The matcha angle is interesting because it's basically their way of attracting customers who might've never stepped into a Costa before - it taps into the wellness crowd and looks different from their traditional coffee identity. That expands their actual customer base rather than just selling more to existing people. They're not just optimizing, they're repositioning.
One thing nobody mentioned: if you want to actually test whether they're really back on track, watch their app and loyalty program activity. Companies that are genuinely fixing their problems tend to use data heavily - tracking what sells, personalizing offers, running localized experiments. If their app feels dead or generic compared to chains like Starbucks, that's a red flag that the turnaround is surface-level. Check if they're offering specific cold drink deals in your area or experimenting with limited flavors. That's the real tell of whether management's actually learned anything.