Hello
I am looking for suggestions on climbers to cover a large wall. Needs to be evergreen, do well in part shade and ideally have a longish flowering season. I was thinking of climbing or rambling rose. Are there specific types that do well in the climate in London / SE? Are there nurseries in London where I can ideally buy something mature that has already grown to a certain height on say a trellis and is potted? I know very little about gardening and have limited time to take care nlmyself but do have a gardener in occasionally who seems unable to advise on where to source.
Your suggestions will be much appreciated! Thank you.