In reply to Eric Herring:
2002 BMC Stanage guide
"The wide crack provides a good route for learning offwidth techniques. Using blocks to the right to get started is cheating, but eminently sensible."
So, maybe the new guide says do it honest, rather than cheating?
PGE , Dec 2001, grades it HVS 5b, but says:
"The wide crack in the tower in the bay is impossible to grade, and just about as hard to climb. Graded Diff for years."
And Eastern Grit - Aug 2006 - (p.103, not in index) VS 5b:
"The wide crack in the tower in the centre of the bay remains a rarely repeated enigma - it was graded Diff for years."
Can't say all that lot makes me want to go and try it...