Flowery orange pekoe. I've not been able to find it for anything approaching a decent price for ages. It was the first tea I ever drank. My mother had a bizarre belief that children shouldn't drink tea or coffee, then, once, when she was out, my grandfather let me have some of his FOP. Hooked from day one! I have some orange pekoe in the house, and it's great, but I miss proper FOP.
There are several grades of pekoe tea, based on the purity and oxidation of the tea leaf tips. Flowery is one of the higher grades, IIRC. Orange is just below. I love it, but I wish I could afford some FOP again, if only for the memories of my grandfather.