Hi Sir Alec...yes it seems to be the golden ones (frisias) that are affected. I have to say that she (sorry I always refer to my robinia as a she, hehe) has flowered two or three times in her lifetime. Obviously the flowers, being white, aren't easy to spot, but smell lovely.
Maybe she'll survive, she's been a tough old boot up to now & survived blowing over in gales a few years after planting. I hauled her back up tied her down with rope & hoped for the best. And last year I had to have a big pruning job done when a large branch split, again in gales, & she grew back better than ever. I'll give her a good talking to. Fingers crossed!