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Runner making their way through confetti filled streets

The Big Half

The Big Half is a vibrant, inclusive half marathon with a fun, festival atmosphere taking place on 7th September 2025.

Date: 7th September 2025

Where: London

Cost: £15 entry fee and a minimum sponsorship target of £350

Sign up: Big Half Registration Form

The details

Sign up via our registration form and you will be automatically set up with an Enthuse fundraising page. We can also provide a Marine Conservation Society running vest!

Take a look at our creative fundraising ideas to help you reach the minimum target of £350 sponsorship. We've got lots of tips and resources on our fundraising and events pages.

Andreea Cioca 2

One of last year's Marine Conservation Society runners celebrates with her medal

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!

Also of interest

Fundraising questions answered