I'm running the 2025 TCS London Marathon in aid of Royal National Institute of Blind People (RNIB), the UK's leading sight loss charity and the largest community of blind and partially sighted people.

Everyday 250 people begin to lose their sight in the UK. RNIB's focus is to create a world where there are no barriers to people with sight loss.

Here's just some of the ways your donation could help:

- £50 could help someone coming to terms with sight loss by providing emotional support and practical guidance through our Sight Loss Advice Service, both on the telephone and online.

- £35 could help provide support and advice to a parent of a child with vision impairment, who has contacted RNIB for the first time.

- £25 could help produce a lively and interactive technology show on RNIB's Connect Radio, demonstrating how an app or device can help people with sight loss communicate easily with family and friends, or navigate their way around town.