I'd cut out that old wood at the back and let the new shoots at the front take over. I took delivery of seven plants from a specialist in Germany this week. (I ordered 9 and paid for them last year, so I expect a refund on 2 soon) They are all doubles and triples. They are basically rooted cuttings in 3 inch pots, I have potted them into six inch pots of rich compost.
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