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.
The photograph is too blurred to show details, but its not Cladonia foliacea.
Photo of C. foliacea for comparison:
It's foliose and could be Parmotrema perlatum but that's a possibility rather than an identification.
As Jenny says, definitely not a Cladonia, and like her, I cannot think of a better possibility than Parmotrema perlatum,but I won't post it as an ID.
Cladonia foliacea is a coastal species, also inland in the Breckland and on other sandy heaths, but I am suspicious of other inland records.
It is coastal so parmotrema perlatum seems to be correct having looked at it again
Lat/Lng: 50.1714, -5.124
OS grid ref: SW770348