Posted: 05/11/2014 at 11:57
I would leave them outside in a sheltered corner - just make sure that they don't dry out too much - that shouldn't be a problem in a UK winter!
The fact that there's new growth may indicate that they've taken root, but on the other hand it may not - cuttings do sometimes put up new top growth when the roots have not developed enough to maintain the growth and if they're disturbed the cutting will die.
I usually leave rose cuttings 12 months before planting them up but mine are usually in a slit trench in the ground rather than in pots. I think you could try potting them on next spring - I'd use a loam-based John Innes No 2 with a little added grit or vermiculite for potting them on - others may disagree.
Let us know how you get on