I second Sarcococca confusa. I have 2 and the winter scent (Jan-Feb) from its tiny, white flowers, is divine when you have it near an open window, along a path, near the front of a border... Mine are in pots but they're equally happy int the ground where they will, over time, grow into lovely bushes. They are slow growing and don't need pruning, although I have cut one of mine hard back when it had become straggly years ago. It has come back even better since. The flowers turn into almost black berries. I have seen large versions of these plants growing in part sun too, which they seem to thrive in, though I have also grown mine in deep shade with good effect (but they grow slower here). They do like a slow, pelleted feed, like Vitax Q4, particularly if in a pot.
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https://www.thespruce.com/shrubs-that-grow-in-shade-2132602
The Sky Pencil Holly (number 7 on their list) might suit your tall, slimline form requirement?
Mine are in pots but they're equally happy int the ground where they will, over time, grow into lovely bushes.
They are slow growing and don't need pruning, although I have cut one of mine hard back when it had become straggly years ago. It has come back even better since.
The flowers turn into almost black berries.
I have seen large versions of these plants growing in part sun too, which they seem to thrive in, though I have also grown mine in deep shade with good effect (but they grow slower here).
They do like a slow, pelleted feed, like Vitax Q4, particularly if in a pot.
https://www.crocus.co.uk/plants/_/sarcococca-confusa/classid.4367/
https://www.rhs.org.uk/Plants/Nurseries-Search-Result?query=125665