In reply to JJL:
Make like you're going to Australia and then follow the path around and down to the tunnel. Tunnel is obvious as you walk to the Australia steps. If I'm taking new people I often have them abseil into Dalis and then walk around the right hand side (past the fence) and up to get to the tunnel that way, last time I went it was pissing down so I went left and down.
If you're abseiling into Dalis again make like you're going to Australia and when you get to the top of Dalis go right so you're stood up above the fence and there's a stake you can ab from.
Wet/boring route is blue, abseil is red:
http://i.imgur.com/w8SXMDp.jpg
Edit: pic.
Post edited at 10:06