Can anyone suggest an evergreen climber to cover a rustic trellis?

We already have three Clematis, two Potatoe Vines and a Honeysuckle (all non-evergreen), and have planted lots of sweet peas to fill the gaps this summer, but would also like something for the winter.

The soil is good (lots of compost dug into it), it gets the sun most of the day, but is quite a windy spot in the garden.