Premise:
"And more precisely, they were copped up on a small, two-seater sofa."
Hypothesis: They were copped up on a sofa that was made of leather.

it is not possible to tell

Premise:
"You are too amiable, madame. Still beaming, Poirot marshalled us all into the drawingroom, bringing forward chairs as he did so. "
Hypothesis: Poirot lead the other into the drawingroom and offered them chairs to sit on.

yes

Premise:
"now the one thing i did approve of there was that we didn't have to be unanimous because it was a civil case"
Hypothesis: There were other things about the case which I found very wrong.
it is not possible to tell