Originally Posted by corporate-wage-slave

Formally no, I'm sure you can get a second sub 150 ml slosh of tea, but the way it works on EDI-LCY is that the operating time is about 45 minutes or so. There are 2 cabin crew, the senior crew member will typically look after the CE passengers until they are done, and then if time / demand permits move to ET. On that sector it's probably the last 20 minutes or less of the flight if breakfast, maybe a bit more if mid afternoon. By this stage the ET trolley is usually about half way down the ET cabin, maybe a bit more. So as you can see the rear of ET - usually less busy - tends to be served rather late and it's very difficult to get a second tea at that point. Rationing is more by dint of the time remaining, more than anything else. What you can do, quite easily, is ask for (e.g.) a tea and a sparkling water at the first stage, and so you can get towards 300ml of fluid that way. But in practical terms you would not easily get 2 cups of tea one after the other. Very occasionally - on an E190 on that route, the last few passengers will only be allowed a quick cold drink since the flight crew may have called on descent. I doubt it happens on E170.