Help! Shady dry corner under willow

Hi, Any advise what to plant for evergreen screening up a trellis fence panel, and climb into a willow tree? so when its bare we have screening from upstairs neighbours windows? tall ask Im sure. I want something i can just leave. I have a compact wisteria but it won't like the shade in summer i guess, thank you
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What else is around - fence, wall? A section of trellis isn't very big, so that will also determine what will thrive. Willows soak up all the available moisture usually, so is it dry shade?
I live in west central Scotland - not where that photo is...
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I live in west central Scotland - not where that photo is...
I'd plant some of the early clematis there. The alpinas and macropetalas etc like drier conditions than the larger flowered ones, and don't mind any aspect. Two would fill that space quite easily. They don't need much attention, and no pruning except if they stray too far.
While they aren't evergreen, they come into flower and have foliage from early in the year, and hold it well into autumn. They have a good framework of stems and branches too, so it would certainly create a more dense screen.
Alternatively, the aforementioned Escallonia would do the job. Even some of the bog standard Euonymous fortuneiis would grow up that, and would need virtually no attention. Silver Queen is good for that purpose.
Some Ceanothus would possibly be fine too.
I live in west central Scotland - not where that photo is...