In reply to Steve Parker:
Left Wall is safe but steepish (you said bold and slabby?)
Baby Spice is a boulder problem
Propeller Wall is E3
High Noon is E4 (and quite tough I thought!)
Early Riser is broken legs (or worse) if you fall off the top move.
Unprotected slabs, got to be Psycho! You can jump off the crux (with maybe a sprained ankle) and it just gets easier. That'd get my vote.
However to just answer the question "Easiest grit E5 in Yorkshire?"
I think I found 'The Marine Who Slept In' the easiest, but it's all subjective.
Good luck.