As per title, ESPN,ESPN HD and ESPN Amerrica are free from 0600 Friday 4th march to 0600 Monday 7th march *
http://tv.espn.co.uk/gb/espl/espn-news-updates/espn-news/take-your-seats-for-a-free-weekend-on-espn-2
* From 0600 on Friday 4th March to 0600 on Monday 7th March ESPN will be free to those on the Sky, Virgin, Talk Talk and UPC (RoI) platforms. There will be no discount in relation to the free weekend for existing subscribers to ESPN on these platforms. Free weekend not applicable to Freeview, Top Up TV, BT Vision, Freesat or Freesat from Sky platforms.
http://tv.espn.co.uk/gb/espl/espn-news-updates/espn-news/take-your-seats-for-a-free-weekend-on-espn-2
* From 0600 on Friday 4th March to 0600 on Monday 7th March ESPN will be free to those on the Sky, Virgin, Talk Talk and UPC (RoI) platforms. There will be no discount in relation to the free weekend for existing subscribers to ESPN on these platforms. Free weekend not applicable to Freeview, Top Up TV, BT Vision, Freesat or Freesat from Sky platforms.