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About this event

Swim Serpentine, organised by London Marathon Events Ltd, is the biggest open water swimming event in the country. It has rapidly grown to become the UK’s top open water swimming event with more than 6,000 entries last year!

We’re thrilled to partner with London Marathon Events and bring you Children with Cancer UK Swim Serpentine. The day will feature open water swimming events in the Serpentine Lake in Hyde Park over a range of distances, including ½ mile, one mile, two miles, six miles and a free Wellness Festival in Hyde Park.

Secure a charity place.

Details for the 2020 event are still being confirmed. If you would like to register your interest and be the first to find out when registrations have opened please do email us at

Have you secured your own place?

General entry has not opened for the 2020 Children with Cancer UK. To be the first to find out when it opens please email us at and we will let you know when the details have been finalised.

What to expect from Children with Cancer UK

You can be part of our team whether you secure your own place independently of the charity or are allocated one of our charity places.

  • Fundraising Pack containing lots of fundraising advice
  • Regular emails providing top tips and information
  • Access to our open water swimming training plans.
  • A bright Children with Cancer UK T-Shirt
  • The best support and loudest cheers on the day


Location & Date

  • Hyde Park, London
  • TBC

View map

Contact Details

Join The Children with Cancer UK Team

Own Place

General entry for 2020 is not open yet

Own Place Form

Registration Forms

General entry for 2020 is not open yet

General entry for 2020 is not open yet

Children with Cancer UK @ CwC_UK

"It's nice to be normal and do fun things as that sort of goes out the window when they're having treatment". We were delighted to welcome over 200 guests to @altontowers last month, all of whom have been affected by childhood cancer in some way.

Children with Cancer UK @ CwC_UK

@blueboy260309 Dr Jill was lovely to interview and was really proud of how far you have come. Hope all is ok with you and enjoying school.

Children with Cancer UK @ CwC_UK

Have you voted for one of our amazing films in the @CharityFilm_ Awards? Please vote for and Voting closes Sunday 1st December. Pls RT. Good luck to all the other films. #charityfilmsawards