On the drive below a Buddleia bush. Appeared suddenly (I think).
No interactions present.
Browsing through other entries in here I spotted this one which looks similar and was identified as being Cyanobacterium (Nostoc commune)
Yes, Nostoc belongs to the cyanobacteria
University of Edinburgh and Biodiversity Observatory (OU)
To find out more check out this website which I found more helpful than the Encyclopedia of Life.
Lat/Lng: 52.036, -0.7917
OS grid ref: SP829381