Tetley Extra Strong is a delicious blend of specially selected teas with added Assam to create a bold, refreshing and full flavoured taste. The perfect pick me up. Welcome to The Tetley Blend Collection. Using only the finest teas, our master blenders, along with 175 years of blending expertise, have crafted a range of blends carefully tailored for those who want a little bit more from their cup of tea. So however you prefer your tea, we've got the perfect drop for you.