Expected July 2027
Distance
Start Time
Cutoff
Terrain
Two days of lake circuit races near Milton Keynes featuring marathon and half marathon distances, lap based courses, official time limits, race support and bespoke finisher medals.
Caldecotte Lake circuit
Lap based courses
Flat and scenic
Start / Finish
Premier Inn, Lakeside Grove, Bletcham Way, Caldecotte, Milton Keynes, MK7 8HP
Same as start
Terrain
Route
Race Day
What to bring
Suitable clothing
Suitable footwear
What you get
Finisher medal
Starter
Timekeeper
Race referee
On the day
Toilets
Marshals on course
Before you enter
Other questions
Lap based course around Caldecotte Lake, clockwise. Marathon is 7½ laps, half marathon is 3½ laps.
Yes, mandatory race briefings take place before each race.
All finishers receive a unique bespoke medal.
Refunds are not available under any circumstances. You can defer up to 7 days before the event and transfer to another Enigma event that isn't closed to entries.
Entry fee
Registration isn't open yet. We'll show pricing when the organiser confirms.Milton Keynes, United Kingdom
Expected July 2027
Provisional date, around Jul 17Are you the organiser of Railway Run & Formula One?
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