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Images shows a group of three walkers walking along a trail with other walkers in the distance. Green fields and trees line the trail. 'Chiltern 50 Challenge' is written on the top right of the image.

Chiltern 50 Challenge

This ‘end of season’ 50km looped route covers some of the best of the Chilterns countryside. You can walk, jog, or run along historic trails and over rolling hills. A half distance 25km challenge is also available.

The letters FAQ in green sitting on top of lots of question marks in red, green and blue

Fundraising FAQs

Fancy fundraising for Retina UK? Here’s a few pointers to help get you started.

Ultra Challenge

Ultra Challenges 2025

With 18 events to choose from in 2025, these hugely popular events are back for another year! Whether you run, jog or walk, you can support Retina UK's vital work whilst achieving an amazing personal goal. Join #TeamRetinaUK today!