Choisya × dewitteana Aztec Pearl, is a form of Mexican orange blossom. It’s a green evergreen with a vibrant mass of white stars shaped fragrant flowers that perform both in the spring and autumn. They can comfortably grow to 1.5m but I keep mine as a mid-height shrub at about 1m.
It slips into most sunny borders with reasonable drainage easily. This is quite a performer and with white flowers and longish thin leaves helping it blends in well with other shrubs.