start at s/f mark in gateway on b4396, 200m. west of junction with a495. proceed east, joining a495. turn left after ½ mile onto unclassified road s/p treflach. turn right at t-junction (give way) 1.6 miles, onto unclassified road s/p trefonen. continue through trefonen; turn left onto unclassified road s/p racecourse at 4.2 miles. turn left (give way) at t-junction onto b4580 at 6.3 miles. continue through llansilin, and straight onto unclassified road to green inn, 13.2 miles. turn left (give way) onto b4396 to finish – 16.9 miles = 1 lap.