Although it is adjacent to the M40, the only access route is from the Oakley Wood car park (SP611117), as Neil describes at posting.php?mode=reply&f=29&t=4065&sid= ... d6#pr72730
You could stage a breakdown on the M40 and hop over the fence but, by then, the Police would have coned off one lane around your car and the resulting tailback would hit the national news headlines
![Surprised :o](./images/smilies/icon_surprised.gif)
Mike