In reply to Climbpenguin:
Competing factors:
Your '50m' rope is likely to be more than 50m, possibly 5/6m more. But it might not be!
A standard rethreaded Fig 8 uses at least 2m of rope.
Get it wrong and the entire cliff explodes (that isn't true) but do tie a knot in the end.
Plenty of shorter routes available... in fact there are plenty where you can do two routes at a time with a 50m!
Do you know what to do it you do end up 4/5m off the ground with no rope left?
Post edited at 16:35