Get 25% off your registration!
As The Royal Marsden Cancer Charity are an Associate Partner on the 2025 Ultra Challenge series, you’ll get 25% discount on the ‘Full Sponsorship’ registration fee when signing up to fundraise for us!
Challenge yourself with seven great events to choose from this autumn and winter!
Walk, jog or run at your own pace on the Ultra Challenge Series event of your choice. With 10km, 25km, 50km,75km and even 100km challenge options available, there’s a challenge for everyone! You can join either as an individual or as a team of friends or family – the more the merrier.
On this page:
How to take part
Registration
Sign up via Action Challenge and make sure to choose to take on your challenge in support of The Royal Marsden Cancer Charity. Registration fees and minimum fundraising targets depend on the event, distance and funding option you choose.
Fundraising
You will have a dedicated member of The Royal Marsden Cancer Charity team on hand to help you with advice and tips for fundraising. We will be there for you every step of the way!
Get ready for your trip!
Our partners at Action Challenge will provide everything you need to help you get ready for your trek, including training plans and discounts for any new gear you might need to purchase.
Take on the challenge of a lifetime for The Royal Marsden Cancer Charity
Join us for your unforgettable adventure knowing you've raised vital funds that will transform the lives of cancer patients around the world.
Payment options
Each event offers three funding options so you can make sure the challenge is right for you:
- Full sponsorship for charity – You'll pay a small registration fee and have a minimum fundraising target. We will pay for your event place.
- Mixed funding for charity – You'll pay for half your place and have a smaller minimum fundraising target. We will pay for the other half of your event place.
- Own place charity fundraising – You'll pay for your whole place so you won’t have a minimum fundraising target, we will just ask you to raise as much as you can.
South Coast Ultra Challenge
| Date: 6-7 September 2025 | Location: Eastbourne |
| Event type: Walk, Jog, Run | Distance: 25, 50, 100km |
| Fundraising target: £100-575 | Registration: £20-50 |
(Get 25% off your registration for the Full Charity Sponsorship option!)
The South Downs National Park is a superb backdrop for adventurers to take on a real challenge. An Eastbourne start, up Beachy Head, the Seven Sisters and along the South Downs Way before finishing in Arundel. Find out more and sign up today!
Thames Moonlight Walk
| Date: 12 September 2025 | Location: The Oval |
| Event type: Walk, Jog, Run | Distance: 10, 16km |
| Fundraising target: £150 | Registration: £10 |
(Get 25% off your registration for the Full Charity Sponsorship option!)
A fantastic evening walk through London, taking in famous landmarks including St Pauls, Westminster Abbey, Tower Bridge, the London Eye and more! Ideal to take on with friends, family or work colleagues and a great opportunity to see the capital at it’s best. Sign up today for a Friday night to remember.
Thames Bridges Trek
| Date: 13 September 2025 | Location: London Thames |
| Event type: Walk, Jog, Run | Distance: 10, 25km |
| Fundraising target: £100-275 | Registration: £20-30 |
(Get 25% off your registration for the Full Charity Sponsorship option!)
Setting out from Putney Bridge, it's east towards the city, zig-zagging over the array of historic bridges - each with its fascinating story. There will be a finish line celebration in Southwark, past the majestic Tower Bridge. Don’t miss out! Sign up today.
Chiltern 50 Ultra Challenge
| Date: 27 September 2025 | Location: Henley |
| Event type: Walk, Jog, Run | Distance: 10, 25, 50km |
| Fundraising target: £100-375 | Registration: £20-40 |
(Get 25% off your registration for the Full Charity Sponsorship option!)
This 50km looped route covers some of the best of the Chiltern countryside. 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. Sign up to make a difference today.
Kent Downs 50 Ultra Challenge
| Date: 11 October 2025 | Location: Kent Downs |
| Event type: Walk, Jog, Run | Distance: 10, 25, 50km |
| Fundraising target: £100-375 | Registration: £20-40 |
(Get 25% off your registration for the Full Charity Sponsorship option!)
Join this wonderful trek in the ‘Garden of England,’ starting on the North Downs Way and following the river Medway. This picturesque event is a great way to finish off the ultra challenge season and features a show ground finish line celebration. Sign up today!
London Halloween Walk
| Date: 25 October 2025 | Location: The Oval, start and finish |
| Event type: Walk only | Distance: 10, 25km |
| Fundraising target: £70-275 | Registration: £20-50 |
(Get 25% off your registration for the Full Charity Sponsorship option!)
Join this wicked 10k walk and horrific 25km Halloween hike. Starting and finishing in the Dungeon, deep in the Oval cricket ground, this event sees challengers don their favourite Halloween costume for a night of spooktacular fun. Take on highlights of London’s landmarks, some horror hot spots and a few nasty neighbourhoods. Sign up if you dare!
London Winter Walk
| Date: 24 or 25 January 2026 | Location: The Oval, start and finish |
| Event type: Walk only | Distance: 5, 10km, Half or Full Marathon |
| Fundraising target: £75-300 | Registration: £10-50 |
(Get 25% off your registration for the Full Charity Sponsorship option!)
Start the new year on the right foot! This is a great event to walk off the Christmas and New Year celebrations. All distances start and finish at The Oval Cricket Ground, and take in highlights of the Thames, it’s historic bridges and many of the capital’s landmarks. Find out more and sign up today!