My impression is that someone has grown the very large, rampant white Clematis 'Huldine' through a conifer tree.. it flowers in August with the most quantity of flowers appearing at the top, as they tend to face upwards towards the sun..
I meant to put this link to google maps showing a group of Eucryphias in a church garden in the west country.. the flowers look smaller and not such a mass of white as in the photo above.. https://goo.gl/maps/oufLoturemF5PqwE9
Posts
https://goo.gl/maps/oufLoturemF5PqwE9
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.