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Don't be bold with pruning Rosemary! If you prune it back to old wood it maay well not produce any new shoots. I would prune it back to about 1 inch (2.5cm) above the old wood. This may cause it to produce shoots on some of the old wood stems.
Many thanks for this. WHEN do you suggest I do this as the plant seems to keep sprouting 12 months a year!