I am 95% sure I saw a pine marten yesterday!! Something very dark, almost black and far too large to be a melanistic grey squirrel (and too agile to be a cat) shot up a pine tree after a large grey squirrel. It appeared the squirrel escaped because after they climbed up out of sight the commotion soon stopped and I did see a grey squirrel come back down and jump from a lower position to another tree. I did not hear any squeals. I waited for a while even though it had started raining, but I did not see the apparent marten again. The sighing took place in local woods outside Alcester.
I shall be spending the whole day up there tomorrow with camera in hand.
I'll report this to the Vincent Wildlife Trust later today.