In reply to Rev. Mick!:
With a definite Scottish bias, I'll offer:
Diagonal Crack - Red Wall (north Aberdeen seacliffs)
No 1 Chimney (Clachnaben)
Moonjelly and Tystie Slab (both Reiff)
Agag's Groove (Rannoch Wall)
Northeast Buttress and Observatory Ridge (Ben Nevis)