The ones I've got are the very simple, single white, single frilly green-edged inner circle, like I remember from childhood, when nothing was a cultivar! And look as if they've been spreading happily for years. So hopefully they're ok.
Regarding the hat, I was at cropredy folk festival, and that sort of thing brings out the worst in me, hat-wise. I feel among my own people, as everyone dresses like they're inside a kalaedascope, whereas normally, it's just me. Don't you like the blue? Or is it the hat generally?
It was one of the more subdued of the hats I bought there. Haven't worn any of them since. The world isn't ready!
I'll go and look for Kew Gardens website, Brachystegia. That sounds like fun.
(Why Brachystegia, by the way? Is it a favourite tree? Or is it a play on Mutsiwa, the one who is left behind?)