In reply to Greasy Prusiks:
> I thought it was because of the different style of climbing on grit.
Yes, I guess that many good climbers who'd achieved something illustrious could be "taken down a peg or two" by grit, because of its specific style (for someone who'd not done a load of other sandstone - climbers familiar with other sandstone don't tend to flounder, e.g. Ondra). As such northern (Peak/Yorks/Lancs) climbers could bolster their egos with this?
To the OP:
> What's so special about Gritstone, compared with say Limestone, Granite, Sandstone or any other rock?
I'd say it's a particularly "distilled" style. The cracks are *really* cracky (require expert crack climbing technique) and the slabs are *really* slabby (they have no holds and require expert slab technique). With the accessibility of crags, when you climb on grit it's a very upfront test of how good you are at climbing the rock, including how bold you are. In other places there's a lot more at play.
Limestone is just pulling on holds and is ubiquitous - there really is nothing special about limestone. Similarly our volcanics also don't require any specialised techniques the way sandstones (inc. grit) and granite do.
> For a start most Grit climbs are comparatively short
This I think is part of the point. "You may be able to climb 40 pitches of loose, cold, crud - but can you do *this*?".