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When I had the plumbers in not long ago they didn't drink tea or coffee either. I think they just wanted to get the work done as quickly as they could.
My workman at the moment hardly has a drink either. I wondered if it was because they didn't want to keep weeing all day, while in people's houses.
I've had workmen ask me if they could use the bathroom and the mischievous side of me has considered what if I said no? I would never do that but that's one instance of odd thoughts that pop into my mind from time to time.