In reply to Tom Randall - Lattice Training:
Hi Tom,
It depends whether you mean at the time or now, as routes have lost holds/changed lines. There's also that element as Doug says of defining the most difficult- serious/technical etc
Contenders are:
Doug E8 6c still had few ascents but has been flashed almost o/s.
Gaia E8 6c - lots of repeats
End of the Affair E8 6b - lots of repeats
Thing on a Spring Originally E6 7a but pebble used to dyno off now gone, safe enough but now E6 7a/b? Unrepeated since pebble gone?
The Children's House E6 7a - safe enough short sequence but yet to be repeated despite attempts by good climbers
The Screaming Dream 1987 E7 7a - safe but hard, repeats.
Happy Hart E7/8 7a/b - see below
Lots of E7 6c's all of which have had repeats
If you go into 1989 - Parthian Shot E9 6c at the time. KP Nuts E6 7a - few repeats.
One that stands out is Happy Hart at Curbar although its only over the past 10(?) years or so that people have began to realise how hard it was. One suggestion was that maybe pebbles had come off since John Hart did it or that his exact sequence wasn't known and that his foot/feet may have used (a) hold(s) in Scroach. The grade I came up with after talking to people when researching for Peak Rock was E7/8 7a/b nowadays. There's an account by John in Peak Rock.
Food for thought. I've probably missed a few!
Cheers Graham