It's the Silent Woman dan_bo....... ain't no ladies in Slawit.
Climb out of Slawit past the Swan Pub, up through the Clough, round the hairpin, then straight on up past Bolster Moor on Slaithwaite Gate, and I live at just about the highest point on that road, just off Scapegoat Hill High Street.
Never done that climb on the road bike, and rarely attempt it even on the MTB.
Steepest one I've done for a bit is the climb up out of Dean House Lane to the back of Marsden Gate. At one point I was right on the nose of the saddle and the front wheel lifted on every pedal stroke.