Well, I stand corrected and have just had a building lesson, Portuguese style
Only the wall with the fireplace is load-bearing. Apparently, there is a dirty great beam that runs from one end of the house (with the big window) all the way to the other end of the house, hence needing the daft pillar.
Now, if we'd have designed the house, would have done it differently, but we didn't so will live with it as it is.