This plant started to grow out of my patio a while back and I've trained it up a wooden ladder (from Freegle ftw!) I'm have no idea what it is but it looks like a passionflower. But passionflowers have seeds in fruit and are a bugger to grow according to the internet so I'm not convinced that it is. If it is, how on earth did it get there?
Its now got some flower buds on it so I think I will find out for sure when they open. If anyone can shed any light on it please let me know!