Radiohead guitarist Colin Greenwood has announced he will join a charity triathlon at Blenheim Palace in aid of leukaemia charity Scarlett’s Dragons.

The guitarist, who lives in Oxford, tweeted : “In a moment of madness I've agreed to enter a triathlon for my mate Dan’s daughter Scarlett - “Sponsor me! xcolin.”

The event, consisting of running, cycling and swimming, will be held on Saturday, June 7 at the palace in Woodstock.