Some people like milk in their tea, some like lemon juice. But you can't use both, the milk will curdle.
But I've discovered that you can combine orange juice with milk in the tea. Just a surprisingly small amount will do it, like one or two tea-spoon-fulls, but it is really delicious. It really adds some lift and freshness to it.
It may make a difference if you use the normal stuff made from concentrate, or the fancy "fresh" OJ.