Rather than chop the height all back … I would try to remove about a third of those stems at the base … taking out the eldest of the stems and reducing the congestion. I’d sprinkle some slow acting organic fertilizer like Fish, Blood & Bone around the base.
With luck that should stimulate new growth from the base.
Then in a couple of years or so I’d take out some more of the older stems … and carry on rejuvenating/maintaining the shrub like that … in that way you’ll retain the height and shelter that the birds need, while also improving the health and appearance.
😊
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
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Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.