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thames bridges participants walking across one of london's bridges
Walking

Thames Bridges Trek

  • Date: 13th September 2025
  • Location: London, UK
  • Distance: 25km
  • Registration fee: £20-£50
  • Fundraising target: £70-£275
Sign up

Join 2500 trekkers as we venture 25km across the capital taking in unrivalled views of the skyline from its best vantage points.

Setting out from Putney Bridge, we’ll head east towards the city, zig-zagging over the array of historic bridges – each with its own fascinating story. 25km later, there’s a finish line celebration in Southwark near the majestic Tower Bridge.

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, before heading to a BBQ and a well earned rest.

As Dementia UK is an official partner of this event, you will receive a 50% discount on the ‘full sponsorship’ registration fee when signing up to support us.

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

  • 25km Challenge
  • 10km Challenge
  • a branded Dementia UK technical sports top (we’ll send this three weeks before your challenge)
  • training plans
  • support from our Fundraising Team
  • fundraising advice, hints and tips in the build-up to the event
  • a range of Dementia UK fundraising materials (collection buckets, posters, balloons etc) to make any events you hold look amazing

Full sponsorship: you pay a small registration fee and we’ll cover the remaining cost of your event place as long as you hit your fundraising goal! As we are an official charity partner, you will receive a 50% discount on the standard registration fee. Prices after the charity partner discount are:

  • 25km challenge: registration fee £30, fundraising target £275
  • 10km challenge registration fee £20, fundraising target £100

For charity sponsorship places, to secure your entry, you’ll need to raise 50% of your full fundraising target no later than three weeks before your challenge. You’ll get lots of support and reminders from us to help you achieve this! The remaining sponsorship can be sent to us in time for your event (or no later than four weeks after your challenge).

Mixed funding: pay half the cost of your event place yourself, fundraise a bit less and we’ll cover the balance of your registration fee.

  • 25km challenge: registration fee £50, fundraising target £150
  • 10km challenge registration fee £22.50, fundraising target £70

For charity sponsorship places, to secure your entry, you’ll need to raise 50% of your full fundraising target no later than three weeks before your challenge. You’ll get lots of support and reminders from us to help you achieve this! The remaining sponsorship can be sent to us in time for your event (or no later than four weeks after your challenge).

Own place fundraising: you pay the full cost of your event place yourself, then fundraise as much as you can – there’s no set target or deadline, and no cost at all to Dementia UK.

  • 25km challenge: registration fee £89
  • 10km challenge registration fee £39

The Ultra Challenge website has further details of the event. For any specific questions about the event, please get in touch with the Ultra Challenge Team at info@actionchallenge.com

Lottie and Frankie, who completed the Thames Bridges Trek in honour of their grandparents

We think this walk is a great starting point for future, longer treks. We’ve grown up around here and want to get to know the historical bridges better. There’s loads to see, and there are a lot more bridges than we thought!

Lottie and Frankie, who completed the Thames Bridges Trek in honour of their grandparents