according to wikipedia -
"The Hardest Part" is scheduled to be the fourth single from Coldplay's 2005 album, X&Y. On 15 February 2006, Coldplay.com confirmed that "The Hardest Part" will be the fourth single. BBC Radio 1 reported that the single will be released on 3 April 2006. The official website has revealed that "The Hardest Part" will be a radio-only single.
Does this mean they won't release the single for purchase?