NWR What is this bush?

Yes. I had one in my garden. At least where mine was, it produced a lot of messy foliage but not much by way of flowers so it has been heavily pruned and relegated to a lesser spot.
Mine ticks some of the RHS boxes

(1) South facing
(2) Sheltered location
(3) Coastal cottage

It has been very happy (and decidedly popular with bees and butterflies), apart from last winter when it was covered in snow for days, and took several months to reawaken.