In reply to yoshi.h:
Corridors of power (Llanberis pass), millennium drive & Malteser-last rites (pill box, Orme), 14 years later (pigeons cave, Orme), pit traverse (Milestone boulders, Ogwen), cosmic wheels (Mallory), nazguls traverse (rhiw goch).
They all involve at least a couple of crimps from memory!