The Big Half

The Big Half is a vibrant, inclusive half marathon with a fun, festival atmosphere taking place on 5th September 2027.
Sign up to the Big Half

    Key details

    Date: 5th September 2027

    Where: London

    Cost: £30 entry fee (non-refundable) and a minimum sponsorship target of £350

    This is an incredible opportunity to run part of the iconic London Marathon course on fully closed roads. The 13.1 mile course weaves through London from Tower Bridge to the iconic Cutty Sark in Greenwich.

    Any questions please email our fundraising team. Good luck!

    The Big Half route takes you past London's remarkable Tower Bridge  |  Image credit: Shannon Tremaine

    What we provide

    We understand that your challenge doesn't start on race day and that it requires months of hard work and dedication, both in training and fundraising. We will be with you for every step of that journey from advice on making the most of your fundraising to cheering you on and offering moral support.

    As a Marine Conservation Society runner you will recieve:

    • Regular emails to provide advice, information and fun ocean facts
    • An exclusive Marine Conservation Society running vest
    • Unlimited support from our friendly fundraising team
    A Big Half fundraiser for Marine Conservation Society. They are wearing a branded MCS running vest

    One of our previous Marine Conservation Society runners celebrating with her medal  |  Image credit: Andreea Cioca

    Ready to sign up?

    Register for the Big Half