In reply to john spence:
Hi John
We have not included route lengths for single pitch routes since 2009 in all Rockfax books, but instead indicate the lengths of the sections of cliff directly on the topo. This was done for a number of reasons. Firstly, and mainly connected with sport climbing, it appeared that people were taking these heights as gospel truth and trusting their lives to them when lowering off sport routes. There are a number of problems when trying to assess the precise length of routes. Sport routes sometimes get extended when re-bolted after publication; people often stand in different places when belaying; people cut sections of their ropes and then forget; ropes sold as a certain length can often be longer than described but not always hence knowing how long your rope is can be imprecise.
Another factor is that the lengths given in guidebooks over many years have been wildly inaccurate. My record is managing a quoted 80m (double) pitch on a 45m rope with belays and knots! Some of these inaccuracies are now being revealed with the modern photo-topos where you can see adjacent routes with very different quoted lengths but quite obviously the same overall height. Luckily it seems most of these inaccuracies are guidebook authors being generous or over enthusiastic when describing the said lines since they are almost always longer than in reality.
So our policy for the last 6 years has been as stated above, a general height on the topo and leave the final assessment of the rope required to the climber. We try now to also avoid text comments like "can reach the ground when climbing on a 60m rope" just in case the rope we are using to measure this turns out to be a 66m rope which is entirely possible since rope manufacturers have not defined a standard on this.
As mentioned by others, for Eastern Grit a 30m rope will be fine for the natural gritstone edges. You may struggle at Millstone, especially if you need to belay on the stakes which are set well back.
Alan
Post edited at 07:10