In reply to h.cook2000:
It's what I use without any issues, if I need to use double ropes then I just fold it over. It's significantly less fannying about than using half ropes in the Peak! Furthermore Grit tends to be mean to ropes anyway, so only having to replace one once it's worn out is substantially cheaper. The ideal situation is once you've cut the ends of a few times and got it down to 25-30 m, as you rarely have to pull more than 10 m of rope up!
However, if you ever want to go climbing where there a proper length routes that weave around a bit, then getting a pair of doubles and learning how they work will be super-handy. Controversially, the world is bigger than the Peak - if you venture out into North Wales you'll probably wonder what all the fuss is about regarding the Peak.
Post edited at 11:12