Last year my paranoia of pigeons meant I kept our early broad beans so well protected that even the bumble bees couldn't get to them. Which meant that they were less well pollinated and so many of the flowers never made it to beans.
This year I have planted some rosemary at the end of the bed, which is one of the few plants to flower at the same time as overwintered broad beans so it should attract pollinators. This is good for the beans, but also good for the bees, which need every help they can get. As well as a shortage of food, bees are struggling to find nesting places in our tidy gardens. If you can't live with a messy garden, but would like to help bees, do please consider hanging a pollinating bee log or bug box. They are easy to make and are unusual garden accessories, even in a tidy garden.