Stephen Sherlock has been investigating this area for many year, the Street House long cairn was excavated in 1979–1981.
The current excavation started in 2004 has turned up Iron Age, Roman and Anglo Saxon finds, theres a detailed explanation of the site in the May/June issue of British Archaelogy.
The open day on 7th September 2008 was technically cancelled due to weather conditions, but Stephen was kind enough to show those who still came around the remains of a Roman building that has just been uncovered.
 UPDATE : The excavations lead to the discovery of the grave of a Saxon Princess, gold artifacts from which can now be seen at Kirkleatham museum