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If it's an early flowering one, do it after flowering, otherwise Feb is the preferred month.
https://www.rhs.org.uk/plants/clematis/pruning-guide
Then again, it's so mild in London, now probably isn't a terrible time.
Have been thinking about repotting (and cutting back) a Clematis that hasn't really taken.
Want to do it whilst it's still dormant but not sure if I should risk it now as it's getting milder, but with the potential for snow in Easter, or wait another month or two