I drink one to two cups of black tea in the morning with breakfast and then I usually have a green tea after dinner. I'm freaking addicted to SoBe Green Tea and Arizona isn't bad either. Oh and green tea with jasmine=awesome.
I have a question for Tez though: is there a major difference between Irish and English breakfast tea?
I think so, there's a Scottish one too. I expect it's the way the tea is blended for the local water. Tea blending is an art so like whiskys, cigars, bread and wines I think you have to find the blend you like.
The teabags sold in supermarkets can be a bland compromise which tries to please everyone. They are easier no doubt but tea leaves and a teapot can make it perfect.