In reply to planaire:
) - how about the advantages of a locking system which renders anchor points useless without a proprietary receiver?
Try a search on here about the Edwards system, just what you are describing but not a success.
> Or have got that the wrong way around? Apologies, my interest in the subject was piqued when I heard it discussed on Radio 4 a couple of weeks back and might easily have got the wrong end of the stick.
A very American viewpoint in that radio 4 piece, not very applicable to Europe
And surely the rope access part of what you propose is covered adequately by the world leaders in fixings, Fischer, with a Hammerset sleeve and a Cover Cap?