I found out.

      Kalmia Latifolia AKA Mountain Laurel.  Seen at Dobbies in one of their planted Troughs.
      I had a grumble about them having no label.  He said we might see some on our way round; we didn't.
      However, I took a shot because it intrigued me.  If you look at the one, fully open Flower and consider this was the third Plant we looked at you can maybe guess my intrigue at the two sizes of unopened Buds.
      SO - having returned, I used one of the Plant ID Apps and took a shot of the Computer screen - it said Kalmia Latifolia - 2nd SO - when I checked result?  100%.