Very overgrown rib / wall / rounded arete.
F6b / V5 / English 6b??? No idea!
A good de-ivying needed as the tree has already been (no too subtly) pruned.

Voting
High f6C+
Mid f6C+
Low f6C+
High f6C
Mid f6C
Low f6C
High f6B+
Mid f6B+
Low f6B+