Virginia Water, under old oak.
Caution: Do NOT use iSpot to identify fungi to eat!
Some fungi are very poisonous so a mistaken ID could have serious consequences.
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I've uploaded the original images
I think my identification is correct, but it is rather atypical and distorted.
It occurs to me that I have collected material of C. furcata very similar to this from the Norfolk coast. My feeling at the time was that it might well be infected by a parasitic fungus, though I have not yet examined it in detail.
I have a section on fungi that grow on lichens as part of my lichen website (with quite a few more photographed and awaiting addition). You have reminded me that it is time I looked through my packets of sick Cladonia!
Lat/Lng: 51.4154, -0.6192
OS grid ref: SU961693