Hydrangea petiolaris or seemanii, Clematis Armmandii (apple blossom) or Parthenocissus (boston ivy)

...or Clematis Nelly Moser. This would ned support of a trellis or wires. Or you could try a free-standing shrub that looks as if it's climbing, such as Garrya elliptica (grey catkins in winter) or Chaenomeles (red or pink or white varieties). I have both of the last two on a north wall.

How about Passion flower.

Thanks for your suggestions

Scottish flame flower if you can get it, but again will need suport but wonderful red flowers followed by blue berries.