Thanks Lampion & Beezle.
Just after I posted this, I found the problem. I also found a couple of other forums with guys with the same problem.
What I did wrong: When I am on the ledge I stood about 3 staps to the left of the edge and jumed right (to save the time of climbing down!), If you do this and then roll left into the tunnel you drop staight down. But if you just drop off the right edge and then roll left, you cath the ledge below. I know "Oddie" (on one of these forums) had the same problem, I cant find him now, but maybe you can and let him know.
Thanks for all the help.
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