In reply to Mark Kemball:
> E1 - requires reasonable fitness and technique and a steady head.
E1 in Pembroke - requires solid trad skills and often no more fitness/technique than a 5+ indoors
E1 on grit - might require really good crack-climbing skills, or the confidence and technique to climb a holdless friction slab with the consequences of breaking your legs if it goes wrong
E1 in the Lakes - could be anything. Could be positive holds, solid rock, good runners if a little spaced, at about f6a. Or you might be fighting up an overhanging crack for 30m, with loose rock, covered in lichen, and no decent gear, fighting death at every step
> E3 - as above, but a bit harder