Shrubs with a white colour theme?

Can anyone help us please?

We are seriously looking to change one of our main borders from herbaceous perennials to a shrub border with a main colour theme of white, whether in flower or in variegated foliage. This takes me out of an area of which I am modestly comfortable to an unknown!

I'm wondering if any member would care to give us their suggestions and as we are going to buy the shrubs, seems logical if we could buy them from a member as well?

I have attached more information on soil type, position, our first stab at a list and a photo of the border

Thanks for reading.

Click image to enlarge