Tom Peirce found the axe heads (over 260 of them) on farmland near Swanage. They were in three locations 50m apart. Wessex Archaeology have since been excavating the site.
There’s a photo of some of them at
dailymail.co.uk/pages/live/articles/news/news.html?in_article_id=509542&in_page_id=1770&ito=1490
on the Daily Mail website.