In reply to AJM:
Glad you've seen what our idea was all about =).
And thus in the spirit of what you're asking (no 600 foot HXS rubble horrors in this lot), a personal selection of less popular routes I've really rated:
South East Climb, The Devils Jump, Cornwall
Some VS I've forgotten the name of, Roche Rocks, Cornwall
Labyrinth, Berry Head Quarries, Devon
Solitude Standing, Ham Hill Quarry, Somerset
Red Square, Nesscliff, Shropshire
Mango, The Brand, Leicestershire
Moonshot, Beacon Hill, Leicestershire
Troy Quarry, Summit Quarry, Deeply Vale, Lancashire
Everything at Windmore End, Cumbria
Everything at The Hoff, Cumbria
The Flashing Blade, Redmire Quarry, Yorkshire??
Some arete that was stupidly mis-graded and grossly underrated in the North East England guide, Park Nab, Yorkshire
Left Arete, The Thirlstane, Galloway