Right, found it. I’d guess that someone has marked it down because it’s difficult. I only got 2/10 ( Ug should be Ugg btw ). But I personally don’t think that grids should be marked down because of difficulty, as what is hard for me might be perfectly doable for someone else. It’s a valid grid but I think what makes it fiendishly difficult is that the nature of the connections for all of the other 3 groups makes the clues wildly different and hard to group.
Dog line was interesting.