In reply to Aaron_TM:
If you plan to climb portland, do not buy less than 60m.
Many climbs on blacknor/battleship side are over 25m. Some are nearly 30m.
And it's not just the hard ones. Look in the book for approximate lengths of route to confirm.
As an aside, I tend to buy a rope every few years, with the older one being cut down at both ends and then beaten into submission at the indoor wall, with it being trimmed each time the ends get a little worn. The new rope then becomes the good outdoor rope.
Your single rope is almost the only bit of kit you won't back up, it is always a single link in your safety chain. I don't mind spending 100 quid or so every few years to ensure it's integrity, as my life depends on it.
Cutting a 70m rope seems unfair on the rope to my English way of thinking, as a 70m rope infers trips to europe (where 70m is needed often) and sunny, beautiful rock. Cutting a 70m seems like a crime... funny how that is?
Safe climbing, kev