Mr Grigg had made a mistake and uploaded some of last week's work again. For those of you that noticed and went on to 'Thursday,' that should have been this week's work for Monday.
It has now been renamed correctly and the work for this week is now in the correct days. If you redid the shape work on polygons, start from Monday again and work your way through the week from the start. I have put a mystery investigation filler on Friday to give everyone a chance to get back to the same point if you need to restart the week.
Sorry for the confusion.