Start at north side of entrance to Stone Briggs Farm (the Alpaca farm after Old Hall Farm). Proceed north on Old Hall road to turn sharp left (0.1m) (care) and proceed along unclassified road towards Windy Ash and Higher Lath farm. Care at narrow section at Chiltern seed farm (M). After Knottallow tarn finish at farm gateway on left side of road 50 yards prior to T junction (1.2m)