In late winter or early spring, as with other roses. For now you shoud just content yourself with dead heading and cutting out any damaged stems after, for example, strong winds.
Have a read of this info from the RHS. Scroll down to get to climbing roses.
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Have a read of this info from the RHS. Scroll down to get to climbing roses.
https://www.rhs.org.uk/advice/profile?pid=178#:~:text=When%20to%20prune%20shrub%20roses,out%20in%20summer%20after%20flowering.