The first two pictures here show a lovely crinoid (sea urchin) ossicle (stem segment) preserved in flint. all flint is later Cretaceous in age, so this must be 85-65 million years old. It belongs to the family Isocrinidae. Based on the similarity to the one in fossils of the Chalk, I might go so far as to give it a name and call it Isocrinus? granosus.
The third photo shows the impression of a bivalve shell on flint. It is a bivalve shell with strong ribbing, so although I can't really say for sure I would say it is something like "Pecten", a scallop, or other bivalve shell with strong ribbing.
The third photo shows another fossil bivalve shell, although I'm not sure of the rock this one is in or the age of it. I might come back to this one later.