Try Clematis cirrhosa - I have 'Freckles', 'Lansdowne Gem' and 'Wisley Cream'. They're all evergreen, and produce flowers in the winter. In fact, they often flower again in the summer - mine have!

How about a Climbing Hydrangea? Slow growing though and must be in shade. Will provide lovely winter interest as well.

I agree with lil.a climbing hydrangea is perfect for the job.Mine has climbed the wall and is making its way down the other side,much to the delight of my neighbours,who think the creamy coloured flowers in june are an added bonus to their garden.Although I like the sound of spritz suggestion as well,and shall be looking for that to add to my already overcrowded garden.

LOL. Sorry, Bernadette! ;-/

How about a Climbing Hydrangea? How deep to the roots go? I have the same problem I am worried about the underground rain drain close by.

I don't think I'd want to grow a climbing Hydrangea too near a house wall - mine is a very old one, and the trunk is thick, almost like a tree, so the roots could very well go down and outwards. It's on a fence, not the house. Clematis stems/roots aren't anything like that, (unless you have a mature C. montana).

I do realise that they're slow growing, but you have to think ahead, don't you.

Ah well, too late for me Spritz as I planted her early this year and she seems to be doing well. Fortunately for me, I don't think I'll have to worry about it if it does become an issue but excellent point.

Good luck with it, then. :-)

Good luck to the next owner. I will have long left this earth by then :)

thankyou for all of your suggestions have decided to try ivy. Hope it grows (Fingers crossed)

I do hope it's not a vigorous one you've chosen, Raybe - some can be real thugs.