No, that's not it FG.

The closest so far has been the Bridal Wreath one, so I still think it must be a variety of that genus.

I cut some off and tried to do the close up thing, but wasn't very successful with this little camera I'm afraid. Also the flowers are dying off now, so the following picture doesn't look so pretty in a close up.

Most of the flowers remained white while some turned pale pink, others went a dark pink/lilac in colour if that helps at all.

I placed a biro nib against the flowers to get you some perception of size.