Garden Q&A: Should I remove clematis from my wall? It looks dead in winter

'I wouldn’t be in a mad rush to remove the clematis as it is so lovely in bloom during the summer months,' says Peter Dowdall 

Clematis Ville de Lyon. File picture

I have a clematis growing on my wall and it is lovely when it flowers during the summer. However, it looks dead during the winter and I am thinking of removing it. Can you recommend a good evergreen climbing plant?