I was originally impressed by this when I saw it in a garden centre in mid winter, when it was just a cluster of rather remarkable charcoal black stems.
Now in flower it's proving to be a very attractive cultivar, with jagged white petals and a fresh scent. In its upright shape, modest size and neat foliage it has something of P.microphyllus about it, which is presumably one of the parents. A very appealing shrub for a small garden.
1L pots ~ £8