Winter Enigma Marathons
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Mystery Marathon & Half Marathon
This event takes place on 25 June 2026 at the Premier Inn, Lakeside Grove, Bletcham Way, Caldecotte, Milton Keynes MK7 8HP. The races use laps of Caldecotte Lake and are run clockwise.
Distances
- Marathon - 7½ scenic laps of Caldecotte Lake (clockwise)
- Half Marathon - 3½ scenic laps of Caldecotte Lake (clockwise)
Course details are provided by the organiser. A route description is given at the event location. Water and toilets are available on every lap of the lake course. Race support includes a starter, timekeeper and race referee. Parking is available in a large pub car park.
Time limits apply to finishers. The marathon has a hard limit of 7 hours; the half marathon has a 4 hour limit. All finishers receive a unique bespoke medal.
Entries are charged per event. The organiser requires suitable clothing and footwear. The event is held in accordance with 100 Marathon Club rules. The organiser does not provide refunds. Deferred transfers are permitted up to seven days before the event and deferred entries must be used within 18 months.
Participants must be 18 years or older on the day, declare they are medically fit to compete and accept that they take part at their own risk. To the extent permitted by law, organisers and sponsors have limited liability. Visit the organization's website for the most recent information.
