Myself and Andy Bowie climbed this quite some years ago in what was probably the 1st ascent. It may have been climbed pre-92 but nobody thought it had.
We did 2 versions both without a heel hook.
1. With LH in start slot and RH on small crimp put LF in pocket by hand (left knee pointing left), snatch undercut with LH then LH again to the small incut crozzly crimp. RF on top of the chimes jug and big pull straight through to the top jug.
2. Basically miss out the undercut and snatch direct to the crimp. Significantly harder than the above.
Both very fingery and snatchy, and would now be good eliminates for those who can be bothered