In reply to GPN:
> There are 2 alternatives; straight up the crack (without the chockstone), which I think is given E3, 5c, and the traverse left onto the front of the flake, and then up which is given E1, 5b. I think the latter is the way most people do it now.
Exactly this. On the E1 variation, it can be hard to find the right line. Last time I did it, the chalk went a long way left and following my leader this way felt more like E2. I have a friend who didn't know about the lack of chockstone and battled up the crack, reporting it to be "f^cking hard for HVS!". I don't know anyone who's done it that way deliberately - logical since if you want an E3 there are much better ones on offer.