Pedal for a Purpose with Immunodeficiency UK Challenges. Whether you’re a seasoned cyclist or a passionate newcomer, our cycling events offer a unique opportunity to make a difference while testing your endurance. Take on the challenge, conquer the miles, and unite with fellow riders to support those affected by immunodeficiency. From scenic countryside routes to gruelling mountain climbs, we have a ride for every level. Together, we can gear up for a brighter, healthier future. Are you ready to cycle for a cause? Have any questions or need support with your fundraising? Just email