I only know of one example on the whole of Hutton Roof which is within a pavement on the Common itself. I surprisingly discovered the plant here in 2014. There is a small population which covers a area of perhaps 4ft x 18". It is shadowed beneath a medium sized Ash tree. Each year I check to see if it has spread but not noticing anything by 2019.
Galium boreale (Northern Bedstraw) - Click over to enlarge
This photo above shows the extent of the single population on Hutton Roof
Galium boreale (Northern Bedstraw) - Click over to enlarge
Although the species is more common to the North, I believe this is probably the most Southerly breeding population for this species in Cumbria and the South Lakes. I do believe a single shoot was recorded back in 2005 in Gait Barrows.