Caryopteris - Heavenly Blue
Medium sized shrub with gorgeous light blue flowers that look stunning when it is in full flower. The stems arch over and put on a good show in a good year.
I have had this shrub for a few years, is in sandy soil in part shade and seems to have done reasonably well. There is one other of these plants that was already in the garden when we moved in 10 years ago in very dry soil under a Leptospermum tree. It doesn't thrive that well there but does manage a few new shoots and flowers each year (I cant move it as there are far too many roots around it and I suspect I would kill it if I tried - that's why I bought another shrub and planted it elsewhere in the garden.)
Some years it flowers prolifically and some years there have been less but attracts hoverflies and some bees. Baccha Elongata seems to quite like this dainty flower.