Posted: 03/01/2012 at 17:30
I expect you want something evergreen, so how about Trachelospermum jasminoides or Clematis armandii? The latter won't like it if it's exposed, though, as it's not 100% hardy. I'm not sure about the hardiness of Trachelospermum, though, as the weather's quite benign here in Essex (usually) and I never saw it much in Oxfordshire. I'm planning on planting one come the spring. My perreniall sweet pea dies back in winter, and of course, the tender climbers die off over winter, but will add a sparkle of colour.
Whatever you decide on, I would avoid Russian Vine. It's a first class thug.