In reply to simondgee:
Sounds like you found it. It's at 149 823, on the RH side of the narrows (looking up). Wide crack with bridging to start, then steeper to the substantial tree. Pretty much everything above the tree is overgrown with ivy. It's the most prominent crack on that section of cliff.
The 1987 guidebook isn't much help, just says "Charge up the crack passing a tree" but it's pretty obvious when you get there. Looks like nobody's been up it in quite a while, although climbing it to the tree and abbing off would still be eminently feasible.
As for the other two Puttrell routes in Cave Dale, Puttrell's Crack is just right of the overhang on the right just after the second narrows. It's fine to the niche and tree, I bottled the top soloing but it looks ok (just felt I wanted a runner), but Puttrell's Arete to its right looks pretty loose and nasty, although nominally the same grade.