Found!

Stanley came in Thursday night looking very dishevelled, looks like he'd been in a fight.
Cuts on his head.
Then yesterday I was stroking him looking at his head, all healing over, but there was a prickly thing that I thought I'd removed.
This morning I felt it again & I removed this claw from Stanley's head.
Cannot believe it was stuck in his head for 2 days.
Stanley is looking back to his handsome self. :)