United Kingdom

I live in Surrey and have seen a magnificent vine nearly smothering a whole house! It's definitely not an ivy or climbing Hydrangea or Virginia Creeper. It's got very large roundish leaves and I can't find it at local garden centres or in my gardening books. I'm sure it's not unusual- I've seen it lots of times over the years. Any idea what it would be?

• 9 Aug, 2012