Place the tea leaves into a spice/coffee grinder and grind until the tea leaves are the size of ground coffee. Pour the milk into a saucepan and place over medium heat. Add in the ground tea leaves. Once the milk has come to the boil, take off the heat and leave aside until cool (or refrigerate if your tight on time.)
Pre-heat your oven to 175C. Grease and line a 6 inch cake tin
Spoon the cake batter into the prepared cake tin. Bake for 50 minutes to 1 hour until golden brown and a skewer inserted into the middle comes out clean. If your cake is browning too quickly, cover the top with aluminium foil for the rest of the baking time.
Once baked, leave to cool in the tin for 10 minutes. Turn the cake out of the tin and leave to cool completely.