Here's a progress report on the raggy rug. It is sometimes called a peg rug, or peg mat. It has grown quite a bit over the last week, and I am getting close to the edges. My kitchen floor has squares on it, which is usefull for checking if things are square or if they have gone off course. You think you are working in a straight line but when you check you can find it has gone all wonky.
At this stage I decided to turn under the edges using the squares as a guide. I tacked lengths of string across with a big needle, tying off the ends. All I need to do now is keep going and stop when I reach the edge. The string won't need to be removed. I reckon another week or two should do it.