Broad beans plants but few pods

I love broad beans but the black fly just gets on top of me. So I haven't bothered the last few years.

Pollinators breaking into the side of a flower to reach the nectar is called pollen robbery as they don't pollinate the flower. This is often long throated flowers like foxgloves...so maybe sticking some potted plants with some single flowers around/growing marigolds on the edge etc will help. I stick marigold everywhere.
I think I watched/read something recently? (Maybe gardeners world as I rarely watch TV )on flower shapes and what birds/bees pollinate each flower. Beak length /shape etc suited to certain flowers.so putting a mix about helps. Ants "rob" pollen too.

That said I think the birds are eating the flowers on my runner beans!