Presumably the flowers are not getting pollinated, Pf. It is the bees and wasps that pollinate ours, do you have any around?

Yes, Bulba, my whole garden is aimed at supporting bees and insects in general. That's why I am so puzzled. I admit there aren't quite as many honeybees about in the garden this year. I wondered whether they're plants of which 2 the same are needed?

are they getting plenty of water? I find they have more berries when it s damper.

Thinking about it, Seaburngirl, that might be a reason. I haven't given them any extra water as they seemed to be doing all right on their own. I'll remember that next summer.