Escallonia advice

Would anyone be willing to advise whether my Escallonia Iveyi hedge is suffering from the effects of a cold winter or the dreaded fungal leaf spot disease?
Photos here of the hedge on planting in Oct 11, in summer & now. 'Picasa Web Albums - Juliet Payne - Escallonia Iveyi' ( )
Or, is it a case of waiting until it starts growing (or not!) to see what happens? Also, would it be worth cutting it back & if so, how hard?
Many thanks.

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