a large number have remained unrepeated because they are shit and do not come with attention-grabbing high grade. My own route on Mary's Tit will almost ceratinly never be repeated for this reason.
The 'Why' is obvious: All or some of the following...
Unknown/Unrecorded
Fallen down
Banned
Retrobolted
Retro chipped
Recorded but too Obscure
Too hard
Too dangerous
FA Climbed under "1 in a million" conditions/circumstances
No idea, I'm a punter boulderer somewhat removed from the uk climbing scene
The answers are going to mostly fall into:
*Too hard - Practiced to death by the super dedicated or simply put up by the super talented
*Too dangerous - Worth risking youur neck for the FA but not a repeat
One or two will come under:
*Unusual phisique or skill required - eg tall, short tiny hands, no sense of pain
*Unpublicised
*Inaccessable
jk
For winter routes, only in good condition once in a blue moon?
Route is naturally dirty, and needs a good scrubbing to make a decent ascent?
Route gets a lot of seepage and only dries out in the height of summer/heatwaves?
In reply to Sean_J: Also, how about there being lots of better routes at that grade, especially the harder routes when there's only a small minority able to climb them? One that springs to mind is Violent New Breed - no disrespect intended to Mr. Gaskins whatsoever, but if you were climbing 9a+ why would you want to work a 6m high boulder problem in a small cave in Yorkshire when there's some of the finest and most impressive lines on the best crags in the world to choose from? Also, i can't see the sponsors being too happy with their finest new talent dedicating themselves to such a route when they should be getting on bigger and more impressive stuff in sunny places and posing for some more impressive photos. In fact, I reckon it'll be a LONG time before VNB even sees someone working it.
I imagine that, there are not many accessible and good routes below e5/e6 which have not seen at least one repeat. If you correlate this with the climbing records page at Planet Fear (http://www.planetfear.com/article_detail.asp?a_id=325), it makes sense to expect your answer is going to lie in the range (e5-e7) - excluding esoteric rubbish.
I suspect a new route, Night Tripper, I did on Ben Nevis in 1971 has not been repeated. In the new Ben Nevis Guidebook it is graded as 'Scottish VS', this indicates that the route has not been repeated. VS was the hardest grade in Scotland then and it is certainly harder than VS. It is also a good route.
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