Deutzia crenata nakaiana
A pretty low growing plant with pure white flowers in late spring.
Like most Deutzia it is unfussy about soil type and will grow well almost anywhere as long as not smothered by stronger neighbours.
2L pots ~ £8
A potentially quite large semi-evergreen species with flaking bark.
The flowers remind me very much of Correa flowers being bell-shaped and with the same soft texture, though in this case a simple chalky white. Easy and reliable in a variety of situations.
3L pots ~ £10