15.65 miles, 4,584 feet, 4 hours 58 minutes: Ambleside - Rydal - Nab Scar - Alcock Tarn - Winterseeds - Grisedale Tarn - Cofa Pike - Fairfield, then the rest of the horseshoe c/w back to Ambleside. Overcast, cloud base at about 1,500 feet, intermittent very light drizzle, windy on top. Terrain damp and slippery. I was OK - just - in a t shirt, gloves, and tights. Not many on the fell, but town is busy with people and cars.