It was so cold we had to take breaks in nice places. Afternoon Tea in Colonnades in The Signet Library - a huge, cavernous columned former Parliamentary Library - ripe for drawing and another chance to try the pens in St Giles' Cathedral - equally lofty but very different.
The snow enforced 3 more days so I took the opportunity for a second go. Proves the importance of preliminary sketches to find the principle lines, points and perspective/s.