this looks like a hypericum St johns wort.

Yes I agree Sbg....great late summer colour.

Yep, really nice yellow flowers, aka 'Rose of Sharon'

Being a bit specific with Rose of Sharon as this is only applied to one species (Hypericum calycinum).

This looks like one of the H. indorum cultivars. It may even be the "Tutsan" (Hypericum androsaemum) but the leaves look a little small in relation to the berries for scale.

Fractal, you're right, it's one of the cultivated ones. Mistermond, they're invaluable plants for almost any soil, but good on clay or chalk. I find, too, they grow quite well in shade
Phil J

Will add this to my wish list.....should do well on my shady side....well, the garden that is...:o))

I have more of these than I can cope with! They go bonkers in my garden.
Lynne x

Then yours are the Tutsan (Hypericum androsaemum) which self seeds around everywhere (a British native by the way). This type in the photo above is sterile and doesn't seed around.

Fantastic help! What a great site!