The only report I can find on the excavations in the Preseli this month so far is in Welsh, so with Dr.Google's help here is a translation:
Over the weekend the research to find out whether there is a link between some of the stones at Stonehenge and Wales have taken a step forward as archaeologists start excavating a new site.
In December last year, announced the archaeological society Antiquity report suggests that some of the stones at Stonehenge Wiltshire, England, may have originated from panes in north Pembrokeshire .
Already, archaeologists have conducted research on sites in the Preseli area south of Eglwyswrw, Garn Goedog and Craig Rhos-y-Felin, and over the weekend they started digging third place close to both, on land farm Pensarn.
The research is being conducted by a team from University College London (UCL) and is being led by Professor Mike Parker Pearson, along with experts from the University of Manchester, Bournemouth and Southampton.
Work is expected to last for several weeks and the main objectives of the research is to try to establish whether there is a connection between the sites, understand the elements and transfer the neolithic stone....