2026 Chiltern 50 Challenge

Take on the Chiltern 50 Ultra Challenge

Choose your distance and pace, and join Team Cancer Research UK in the Chiltern 50 Ultra Challenge, and play your part in supporting vital cancer research.

This 50km looped route covers some of the best of the Chiltern's countryside. You can Walk, Jog, or Run along historic trails and over rolling hills. Starting & finishing at our Base Camp in Henley on Thames, there's a Saturday night celebration BBQ & entertainment with camping options.

Passing through nature reserves, forests, and a few hills with great views it's a route with real variety, and some wonderful scenery and it's all easily accessible from London.With 25km options also-there's a Chiltern Challenge here for everyone!

Download the Event Factsheet for more information.

How to join Team Cancer Research UK

Step: 1

Decide whether you'll enter with your own place or get a charity place

Step: 2

Sign up to get Team Cancer Research UK perks

Step: 3

Get fundraising for life-saving research

Step: 4

Get over that finish line and smash your fundraising target

Why take part with Cancer Research UK?

Meet Bridie

On the day of my first Great North Run I wore my Cancer Research UK vest with pride, I was so happy to be taking part.

- Bridie

Bridie has taken on the Great North Run six times as part of Team Cancer Research UK. She fundraises in memory of her Dad, who died of bowel cancer.

"My first runs were really hard, but I trained and persevered, and I got better. On the day of my first Great North Run I wore my Cancer Research UK vest with pride, I was so happy to be taking part. The atmosphere was amazing and crossing the finish line I was ecstatic! I was so proud of myself and how far I’d come. Every step is worth it. For every person we lose to cancer, it spurs me on even more to continue fundraising so that we can find a cure."

Support for you

Help with your fundraising

Raising money for your marathon can be fun and easy – check out our top tips to hit your fundraising target. See how you can raise money

Get training support

We've teamed up with experts to give you the best training support and advice for your event. Whether it's your first time training or you're looking to smash a PB, we've got a training plan for you.

Get a cheering pack

Our pack includes a Cancer Research UK banner, clapper boards, cheering sticks, balloons, tattoos and running sacks! To get yours email us supporter.services@cancer.org.uk or call 0300 123 5461

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