Posted: 26/11/2015 at 08:08
I'd go with Hydrangea petiolaris - just make sure that it keeps within the boundaries of the wall so that it doesn't invade any guttering etc. I've always found that small birds love hiding in it's branches and inspecting the flaky bark for insects. I've also known robins to nest in an established one year after year.
When it loses it's leaves in the winter, you get a wonderful tracery of reddish stems.
It won't need trellis but will attach itself to the wall but won't damage it. Hopefully your neighbour will be ok with that.
If not, I'd go with pyracantha