This was published in 2009 by Lionel Jackson and me -- and although this is a topic that does not get much attention from geomorphologists, I am still very attracted by the idea that the bluestones might have been transported along a contact zone between two parallel streams of ice (the Irish Ice Stream and the ice from the Welsh Ice Cap).  I shall ponder a bit more deeply.......

https://www.researchgate.net/publication/270162075_Stonehenge's_mysterious_stones