Long run from the Hostel the family were staying in at Milton Keynes. Basically did a massive loop all the way around town on the cycle paths (there are miles and miles of them). Quite nice run, but pretty flat. Did the first 13 miles at 6.30 pace and then the last 5 at 6 pace (roughly 20% and 10% over mara pace). Legs were tired by the end but not totally cabbaged.