Decaffeinated Black Tea. For the love of the planet. Creating the perfect cuppa should also be kind to the planet. So we take care at every stage from crop to cup. Our factory uses 100% green electricity and sends zero waste-to-landfill. For the love of the planet creating the perfect cuppa should also be kind to the planet. So we take care at every stage from crop to cup. When it's time for a cuppa, the average brit leaves the bag in for 1 minute, dunks 3 times and adds a splash of milk. Tetley's tea blenders always boil fresh water and brew for 2-3 minutes before adding milk. But your perfect brew?. That's up to you.