If you get plain Ceylon tea, and don't brew it too long, it's nice without milk. I was a big one for my milk tea, but I honestly prefer it black now. Yorkshire tea works too, PG tips- that sort of thing, but it tends to get too astringent quite quickly: if you switch from the breakfast blends to a single leaf tea it's more forgiving. Darjeeling is best without milk, but Ceylon is usually good, Assam is fine. You could also look into Earl Grey or Chinese tea- those are good milk-free options.