It reminds me of Bog Rosemary [Andromeda polifolia] but the leaves are narrower than I remember mine being.

If it is Andromea they require damp acidic soils.

See if any one else comes up with a suggestion. Very pretty what ever it is and very honest of the gc to say they had no idea.

It’s . . . a lovely unusual small tree! Hope someone can help with an ID.

Thinking it maybe a wax flower couple of people mentioned on a fb gardening group. Looks very much like it .

Yes it does. I used to have that too.

My first thought was wax flower (Chamelaucium uncinatum).We used it a lot in floristry as a filler and I had one years ago in a very large pot. It lasted four or five years then I'm afraid the cold did for it. I believe it's part of the Myrtle family.

The waxflower I sold a decade ago had a much more open growth habit, but new cultivars have undoubtedly come out, since then.