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Done a quick search online and the Forestry Commission website has a detailed section, please see:
http://www.forestry.gov.uk/pramorum
On treatment and management it says; "No cure has been found and there are no effective chemical treatments available. There are fungicides which can suppress the symptoms, but none will kill the pathogen. So the objective of any control approach must be to prevent or minimise any further spread of P. ramorum and the damage it causes. The best available scientific advice is to remove and kill the living plant tissue on which the organism depends for reproduction."
I' ve seen viburnum tinus dying back in this way although I wasn't really convinced it was SOD. Other causes can have similar effects. I think 2 died off completely but 3 others were saved by rigorous cutting back to healthy wood and several years later are doing well. The diseased material had a distinct dead spot in the middle (on a cut surface). So cut it back as hard as it takes to get rid of that (if it's there). I would say a bit of compost as a mulch might help also. That's all you can do really, and if it gets too bad just see it as an opportunity to make a change. One of those that died on me had always annoyed me anyway. And burn the cuttings if possible.