In reply to DomDoesDynos:
> When there is literally nothing else to use, no trees, big rocks, cracks etc....
> Any advice on this in general?
For climbing anchor stakes, scaffold tube offcuts are cheap, long lasting and are easily persuaded to go in with a big enough hammer, 6 lb head minimum ideally. Locally, they even go into slate quarry waste , little soil involved.
Not been mentioned yet, a counterpoise body weight, basically leader sits in a hole back from the crag edge. This even works without a hole on a flat cliff top, the friction on the edge helping somewhat. On a 10 m crag ,the wise leader sits 12m back
Also used the counterpoise technique to abseil in and check out a new crag. Filled a dumpy bag ,SWL 1 T, with rocks. Bag worked well, the crag was a disappointment.
Post edited at 17:59