In reply to An Triubhas:
Well for winter climbs you likely want a 60m rope, while for scrambling a 30m rope would do (and be half the weight and faff).
For British trad, two half ropes are usually better (to minimise rope drag), though you can use a single.
Other than that, any of the ~ 9.5mm single ropes (dry treated if for winter) would likely be fine.