If you want offee that has a very strong but not overpowering flavour, I would recommend Guatemala Elephant beans. You can get them from Whittards or Ringtons (both have online stores, I would recommend Ringtons) and the reason for the fresher flavour is because they are bigger, less of the coffee that is eventually ground has been exposed to the air. On the opposite note, Tesco 'Original' beans are brilliant as a readily available and low cost option. I am quite into the flavour of coffee as I drink espresso. If you are adding milk though, these recommendations are best for the flavour coming through the milk well, as well.