The pavement outside this house (last house in cul-de-sac) is covered with these lichens - more so than the pavement of the rest of the road.
Caution: Do NOT use iSpot to identify fungi to eat!
Some fungi are very poisonous so a mistaken ID could have serious consequences.
No interactions present.
Many thanks to Sarah West, Diotria and Alan S for identifying this lichen for me. Sorry I've taken so long to acknowledge it - but I've only just found out how to do it!
Lat/Lng: 51.7171, 0.5223
OS grid ref: TL743050