In reply to yhpong:
Almost certainly not.
Unfortunately, it doesn't work like that. You don't just have a couple of days of snow, and magically the gully is ready to climb. It takes some build up, melting, freezing again, some more snow, and so on.
Best case, there will be some unconsolidated snow covering the loose rocks in the gully and a perhaps smear of verglass on the tricky move. Worst case, it will probably be a rainy and cold day.
FYI, if you do come up another time when conditions are good, try Chockstone Gully first, which finishes just under Great Gully. Linking the two together gives a fun morning out.