Two or three different foliose, but definitely need help in identification
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.
I think these are bracket fungi rather than lichens.
This looks like the beginnings of Stereum hirsutum, Hairy Curtain Crust Fungi, although, it's hard to tell as it's at an early development stage.
Many thanks for your help,I'm learning v. slowly
Lat/Lng: 51.0, -0.4
OS grid ref: TQ1829