Winter flowering jasmine is evergreen and will grow in a shaded area (I had it on a north facing side of a shed). It has yellow flowers. I have an evergreen clematis (armandii) which is spring flowering and fragrant and extremely vigorous.
Thanks Chris that is a very useful link when looking for individual plants but what I really want are suggestions for compatible plants that have similar levels of vigour, i.e. I don't want a lively passionflower taking over the trellis before the honeysuckle has got going. I would like to have a nice even distribution of different plants to intermingle and give interest throughout the year.