half marathon

The BIG

Running Challenge

London

13.1 miles

Sun 7th Sept 2025

Please Note: We now have charity places available for 2025.
Please email us at fundraising@ocduk.org if you have any questions about running for OCD-UK.

Take in the sights of London and run half of the famous London Marathon course in reverse by taking part in The Big Half marathon for OCD-UK

The 13.1 mile route starts by Tower Bridge and finishes at the iconic Cutty Sark.

Runners pass through the four London Boroughs of Tower Hamlets, Southwark, Lewisham and Greenwich. The Big Half is about more than just the run – it’s about the communities the participants run through. The Capitals diverse communities are celebrated all the way around the route with DJ’s, bands, food and plenty of colour!

Fundraising target of £350 and just £20 registration fee! *

* 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.

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!

Have your own ballot place?

Join Team OCD-UK, you can set your own target and we'll send you a fundraising pack.

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

#FantasticFundraisers

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

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

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

A little something post event (at Christmas)
Entered into a Christmas Hamper prize draw

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!

Have your own ballot place?

Join Team OCD-UK, you can set your own target and we'll send you a fundraising pack.

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.