From Hertford to Thaxted, Linton, Newmarket, Soham, St Ives, Royston and back to Hertford. It was a cold, bright & sunny day with light rain after Royston. It was a bit of a slow journey, especially across the Fens, as there's no protection from the wind yet everything was reasonably OK until 200kms. Unfortunately for the final 6kms the rot set in and there was nothing left in the tank to deal with it. Those last 6kms took over half an hour to cover. From Royston had the choice of the A10 in the dark or the lanes via Sandon, Walkern etc.