identification - What is this shrub with clumps of small white

Last year I started redoing all the front landscaping at my house. At the time, I didn't know this bush flowered, but I moved it to the back to let it grow. What is it? click on picture for full size

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Please help me identify this from my London garden? Large shrub, fragrant clusters of white flowers now, evergreen waxy leaves. Gets decimated by foul smelling caterpillars each year so I'd like to

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