Not sure if that has smelly flowers, though?

Here's some more pics:

See if it passes the Cornus test. Gently pull a leaf apart and see if there are mucilage strands within the veins that hold one side of the the leaf to the other.

photo from Info on Cornaceae

elderberry

^ Well, definitely not Elderberry as they have serrated leaves and:

One of the most distinctive things about elderflowers is the smell: floral, creamy and ‘Summery’.

Cornus in my book. Look at those parallel veins. Not Elderberry which has pinnate leaves and looks entirely different. (Personally the smell of elder flowers in quantity make me feel quite sick. In cordials etc. its less concentrated and smells quite pleasant.)

I also agree on the Cornus/dogwood ID. The flowers, the leaves are both classic Cornus. Are the branches opposite or alternate? That will let us eliminate or ID it as Cornus alternifolia, pagoda dogwood, or one of the shrubby species.