Chiltern Challenge: Bradenham, Park Wood and Naphill

Level B

10th December 2023

Location: Bradenham, NW of High Wycombe
Nearest Postcode: HP14 4HF

4Dec23-Final Details-Final

Please read the Final Details at the above link, it has key event information.

The Chiltern Challenge is TVOC’s premier event of the year.  We are delighted to be able to use the mature Chiltern woodland and slopes at Bradenham, Park Wood, with longer courses also making use of Naphill Common.  We appreciate the kind permission of The National Trust, Friends of Naphill Common and Mr A Stubbings to use these areas.

This event incorporates this year’s SCOA Championships and is a Junior Interland Selection race. If you think you are eligible for the SCOA Championships or are a junior wishing to be considered for Interland selection, then read these notes carefully before you enter. Entries for the SCOA Champs and Junior Interland events close on the 3 December.

Update 9 December  Maps have been printed, so entry numbers for each course are therefore fixed.  Entries will remain open right through to Sunday morning.  However we have now sold out of Green maps, and have only a handful of maps left on other courses.  Meanwhile if you have entered and need to amend your entry, please contact Alun at


Directions / Parking

Parking is free, adjacent to assembly in a field accessed off the A4010 near HP14 4HF, 400m Northwest of Bradenham Woods Lane, (link at top of page) access is along a single unmade track. Participants are requested not to leave the car park before noon.

Terrain Description

This area has been used for the British Middle Championships in 2015 and the BUCS individual race in 2019. The competition area comprises of mature beech woodland and is fast and undulating, with some steep chalk and flint slopes with a complex path network.

The Map

1:10000, all courses.

Start Times

There are two starts. The near start for Light Green and below is 400m away. The far start, for all other courses, crosses a road (not marshalled) and is 1km away.
The event is using Si, it is a Punching Start with all other controls being SiAC enabled. A safety control after the finish has to be punched.
Starts are available from 10:00 to 12:15, with the following exceptions:
Black – Last start 11:45
Brown – Last Start 12:00
Interland Selection starts - 10:00 to 11:00
Those eligible for the SCOA Champs are requested to select a start time which allows them to complete their course and download by 1:00pm to ensure Prize Giving can take place at 1:30pm.
All participants are to ensure they select a start time to enable them to get to the finish before course closure at 1:45pm.


Black, 11.9km, 310m climb
Brown, 10.1km, 260m climb
Short Brown, 8.1km, 215m climb
Blue, 6.8km, 200m climb
Short Blue, 5.7km, 170m climb
Green, 4.7km, 180m climb
Short Green, 3.9km, 110m climb
Very Short Green, 3.5km, 80m climb
Light Green, 3.6km, 140m climb
Red, 5.3km, 155m climb
Orange, 3.0km, 105m climb
Yellow, 2.1km, 85m climb

Very Short Green and above courses have an unmarshalled road crossing on the way to the Start, and a timed out marshalled road crossing (national speed limit applies) on the course. Those that are M/W14 and below are advised not to enter courses above Light Green due to this road crossing. However Interland top year M/W14s targeting M/W16 selection next year are able to 'run up' as required.
The RED course is particularly appropriate for runners who are new to orienteering (and can be run as pairs). It is a longer course but without the technical difficulty of the Green courses.
Non members of British Orienteering are welcome to participate on any course. Families and small groups would find the Yellow and Orange courses more suitable.

How To Enter

Entries are only via SiEntries, using the link at the top of the page. There is no entry at the event. Entries after 3 December 2023 subject to map availability, and entrants will NOT be eligible for the SCOA Championships or Junior Interland Selection.

Entry Cost

Senior BoF Member £16 Non BoF Member £18
Senior on Yellow/Orange £8
Junior £5

SiAC Hire £2


TVOC will not be providing water out on the courses or at the finish/assembly.
Catering: Toms Outdoor British and Continental Food.


Organiser: Chris Poole (TVOC)    email organiser      07851184816
Planner: Nigel Bunn (TVOC)
Controller: Mark Foxwell (BKO)