Only unreasonable if they haven't yet turned off their taps. Apparently up until yesterday it was there global policy to leave their taps running constantly (they use "dipper wells" to clean their spoons so they don't grow bacteria, but other coffee chains don't use this wasteful method), wasting 23.4 million litres of water each day.
Due to bad PR they were supposed to have changed their policy in the UK and Ireland as from yesterday, but I haven't yet been near a SB in the last two days to ask if they've turned their taps off yet.
If they have, you are totally U, if they haven't, everybody who goes there is!