In reply to james1978:
New stakes were placed in November. Two above Earthbound and Terminal Bonus, two above Insider Dealing and Shocks and Stares and two above Venture Capital and Security Risk. They are about 10m back from the top of the routes.
The stakes are in pairs.
One short stake with the top ground off it, it was drilled and a rod pushed through it.
The longer stake was from a fish farm cage with welded pins (to attach chain), the top pins were ground off to make it harder to remove.
After placing the stakes they were all turned a few degrees with a stilson.
They should last for a number of years.