Running Challenge

London

13.1 miles

Sun 5th Sept 2027

A copy of the Big Half Marathon logo. (opens in a new tab)


2027 Big Half Marathon places are now available.

Fancy taking on a half marathon with a difference? Join Team OCD-UK for The Big Half and run 13.1 miles through the heart of London, from Tower Bridge to the iconic Cutty Sark.

With a fantastic festival atmosphere, celebrating the diversity of London, and a route packed with London landmarks, The Big Half is a brilliant challenge for both first-time half marathoners and experienced runners.

Our charity places cost £20* to register, with a minimum fundraising target of £350. Take on The Big Half, challenge yourself and run for a cause that makes a difference to people affected by OCD!

* We want everybody that wants to participate in The Big Half Marathon wearing their OCD-UK running top with pride. So if the registration fee would be a barrier for you to run for OCD-UK then please get in touch and we will do all we can to facilitate your participation.
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Get a guaranteed charity place

Just £20 registration fee, with a LOW fundraising target of £350, but why not push on to raise £500 for OCD-UK!
Register for 2027

Have your own ballot place?

Join Team OCD-UK, you can set your own target and we'll send you a fundraising pack.
Contact us
What’s the difference between a charity place and an own place?
Adam wearing his OCD-UK t-shirt running over some grass during the 2017 Great North Run.

The Big Half Marathon Course

Route subject to change

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#FantasticFundraisers

Some of our #FantasticFundraisers from a previous OCD-UK events.

We hope you might be using the #TeamOCDUK hashtag for OCD-UK soon.

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How OCD-UK Support You

We're going to do our very best to support you with advice and information in preparation for your big day, so you can simply focus on your training and fundraising.

Regardless if you're running for Team OCD-UK with one of our event places, or your own ballot place, we will support you equally, and we will send you...

  • Fundraising Materials
  • OCD-UK running vest or t-shirt
  • Sponsorship forms
  • Copy of OCD-UK Magazine

    • When you reach the minimum fundraising target you will also be sent...
  • Rewards for exceeding your fundraising target
  • Entered into a Christmas Hamper prize draw
What’s the difference between a charity place and an own place?

Charity place:
If you have not entered the ballot in the official event, or if you did enter and have been contacted to say you were unsuccessful in the ballot results, then this option it for you. OCD-UK has guaranteed charity places and therefore by clicking ‘Charity Place’ you will be offered a guaranteed place in the event. We ask for a registration fee to be paid and once we receive this we will send you a welcome pack which will include an OCD-UK fundraising T-shirt.

Own place:
If you have entered the ballot in the official event, via their own website, and they have contacted you to say you have a place in the event, then this option is for you. By clicking on ‘Own place’ you are choosing to fundraise for OCD-UK, and you will be taken through the steps to create your fundraising account. OCD-UK will take some details so we can send you a welcome pack in the post with an OCD-UK fundraising T-shirt. This option is free because you already have a place and we don't request any minimum fundraising amount.

Thank You, we look forward to welcoming you to Team OCD-UK.