Posted: 08/12/2012 at 16:52
Unless the soil is actually frozen, now is a great time to plants trees and hardy woody shrubs, so I would go ahead. As you mentioned Box, it might be wise to have a look around your area to see if Box Blight is prevalent:
If, so the RHS link above also gives some alternative hedging plants which you might want to consider using instead.
Cheers - Bob (another festive forum name change!)