I visited Maiden Castle last year and found a flint core dug out by rabbits. If one looks on google maps you can see two white spots towards the extreme west on one of the outer banks. Should still be there....In fact there were a couple of other possible worked pieces too.
I must say I had an real feeling of well being walking around. Just me and one other chap there. Sunny to begin with then the rain came in. Wouldn’t have had it any other way.