Ok - new photo with flowers attached.

I have also received a message from Karen (thankyou) who says:

I think the plant is called Acnistus something. I grew some from seed a few years ago pobtained from the Thompson and Morgan catalogue. It comes in a pale mauve and white like yours. Not supposed to be too hardy but mine has survived outside in Suffolk in free draining sandy soil and full sun for several years now. I believe it is an Australian ?