We’re back on the North Downs with a fabulous challenge setting out from our Guildford basecamp, and a looped 50 km route which takes in some of the best of the Surrey hills, the North Downs Way, and the surrounding countryside.

A route with real variety and some wonderful scenery & fabulous views out to the south – and easily accessible from London!

You’ll get full support & hospitality, and with 25 km & 10 km options also available, and optional University style accommodation at basecamp – there’s a North Downs Ultra Challenge for you in 2024!


  • For all levels of experience
  • Join as an individual or team
  • Covered rest stops
  • Free food and drink
  • Walk at your pace
  • Run or jog
  • Fully signed route
  • Medics, marshals, massage
  • Medal, T-shirt, glass of fizz
  • UTMB points available
  • Shuttle buses and transfers
  • Optional training walks
  • Challenge mobile app

Sign up and fundraising options

Charity Sponsorship – you pay a small registration fee, do lots of fundraising and we cover the cost of your event place!

  • 10km: Reg fee £10 / fundraising target £100
  • 25km: Reg fee £20 / fundraising target £240
  • 50km: Reg fee £30 / fundraising target £360

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

  • 10km: Reg fee £22.50 / fundraising target £70
  • 25km: Reg fee £50 / fundraising target £150
  • 50km:Reg fee £75 / fundraising target £225

Own Place – you pay the full cost of the event place – fundraise whatever you want, with no set target or deadline, and there’s no cost at all to the charity.

  • 10km: £39
  • 25km: £89
  • 50km: £139


Email fundraising@bowelresearchuk.org if you have any questions!