Help needed!

This is my Choisya, bought last year and thrived since planting until about a month ago when it suddenly started dying! I have checked for it being pot bound but the roots have spread, it has been fed and regularly watered and the three rose bushes in the same patch are all thriving really well. Anyone know what is happening here and can I rescue it??
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Mind you, the leaves at the centre of the bush look worse than those on the outside, which leads me to think that it has died rather than being just damaged.
When you say you watered it regularly, you don't mean throughout the winter do you?
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
Let us know how it goes
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.