In 2014 Thomas returned to Birmingham-based blood cancer charity Cure Leukaemia to help them raise £2 million in two years. As patron of the charity he rode in two cycling events in 2015. In June he led 300 riders including Mark Bright, John Salako, George Lineker, Ian Wright, Aidy Boothroyd and Jill Douglas from London to Paris. In July 2015 Thomas completed all 21 stages of the Tour de France route, one day ahead of the race itself. His aim was to raise £1 million from this event, a figure that one leveraged by Cure Leukaemia's model would be worth £10 million in potentially life-saving drugs for blood cancer patients. The 11-strong team completed the route and raised a substantial amount of funds; fellow cancer survivor Lance Armstrong joined the team for two stages.