Hesperis matrionalis in its pale form.

It is indeed and a lovely plant.
I have 3 different colour white, pale pink/lilac and a mid lilac. All wonderfully scented at this time of year. If you allow it to go to seed you will have hundreds of seedlings next year.

I have only one this year, just about to bloom. It is nowhere near as magnificent as yours! Wonderful for bees and butterflies.

Thanks you all so much. I’m delighted that I can put a name (and a label!) to it!