The brands use different schemes. Twinings and Taylors of Harrogate (Yorkshire tea) state they are part of the Ethical Tea Partnership. PG and Tetley both list sustainability reports on their websites ...
When taking the tea bag out of the water, it's recommended to only give it one small squeeze on the side of the mug.
Yorkshire Tea said: "It’s all a question of heat. Tea brews best in very hot water, but adding milk cools things down. So if you’re brewing tea directly in a mug, it’s better to add the milk ...