About the event

Date: Saturday 28 September 2024

The Chilterns 50 event is part of the Ultra Challenge Series – 16 great events where you can walk, jog or run your chosen distance in the UK’s most iconic locations!

This 50km looped route covers some of the best of the Chilterns countryside. Starting and finishing at our Base Camp in Henley Showground, there’s a Saturday night celebration BBQ and 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 and 10km options also – there’s a Chiltern Challenge here for everyone!

Your entry includes free food and drink at regular rest stops, plus support including medics, marshals and massage. As you cross the finish line, you’ll get a glass of fizz, t-shirt, and a medal to commemorate your achievement.

Head to the Ultra Challenge page to find out full details of prices and how to sign up.

By joining #TeamAnaphylaxis, you’ll be raising invaluable awareness and funds that will help provide trusted and scientifically based resources for individuals and their families, businesses, and places of education. Together, we are creating a brighter future for people living with serious allergies. Thank you.

Fundraising Options

Choose the option that’s best for you, and we promise to support you in reaching your fundraising target.

1. Full Sponsorship
You pay a small registration fee, do lots of fundraising and we cover the cost of your event place!

  • 50km: Registration fee is £30. Fundraising target is £360 for Anaphylaxis UK
  • Shorter distances and lower fundraising targets are also available


2. Mixed Funding
Pay half of the event place cost yourself, fundraise a bit less and we pay the balance of the event place cost.

  • 50km: Registration fee is £75. Fundraising target is £225 for Anaphylaxis UK
  • Shorter distances and lower fundraising targets are also available


3. Own Place Fundraising
You pay the full cost of the event place, fundraise whatever you can, with no set target or deadline, and there’s no event place cost at all to Anaphylaxis UK!

  • 100km: £139
  • Shorter distances and entry fees are also available

In return for your support, you will receive:

  • A fundraising toolkit to give you tips and advice on how to make your challenge enjoyable and a success
  • The very best support from the Fundraising Team to help you with your fundraising efforts and answer any questions you may have
  • An Anaphylaxis UK branded t-shirt.


We know that fundraising can be just as challenging as the event, but we’re here to support you every step of the way.

Sign up to the Chiltern 50 Ultra Challenge 2024

Sign up

Any Questions?

We would love to hear from you and answer any questions you may have. Feel free to get in touch with the Fundraising Team.