Carpenteria californica is not a climber and is quite an unusual plant...see pics below.
Mystery plant appears to be a twining climber. Leaves are opposite, evergreen. My vote goes to very easily available Lonicera ..one of the honeysuckles. Would be happier to see flowers to know which one it might be. Lonicera henryii maybe????
Quote RHS....Carpenteriacalifornica
tree anemone
A medium-sized, bushy evergreen shrub, often spreading in growth. Leaves narrowly elliptic, shiny green above. Flowers to 7cm in width, pure white with conspicuous yellow stamens
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I can't claim to be 100% sure though.
https://www.burncoose.co.uk/site/plants.cfm?pl_id=909
Luxembourg
Mystery plant appears to be a twining climber.
Leaves are opposite, evergreen.
My vote goes to very easily available Lonicera ..one of the honeysuckles.
Would be happier to see flowers to know which one it might be.
Lonicera henryii maybe????
Quote RHS....Carpenteria californica
tree anemone
A medium-sized, bushy evergreen shrub, often spreading in growth. Leaves narrowly elliptic, shiny green above. Flowers to 7cm in width, pure white with conspicuous yellow stamens


When flowers appear I shall post a pic