Thank you everyone for the answers to my question. See post that sets out the request that this answer relates to.
First, we asked for filter coffee, which we were told we could have.
Second, because we know the hotel has the choice of either single or double cafetieres, we did not mind which we received, either a single each, or, a double cafetiere between us, was okay.
Third, we wanted a little pot of hot milk to help ourselves to with our cafetiere of filter coffee. (One of us has milk with coffee the other does not).
A double cafetiere appeared with the plunger already plunged. While we waited for the expected little pot of milk to arrive, I started to pour the coffee. I was surprised to see milky brown liquid appear. There was another surprise, the liquid was undrinkable because the milk mixed into ‘drink’ was sour!