My over-wintered broadbeans (Aquadulce) are covered in flowers, but there is a worrying absence of little pods. A recent article by Val Bourne in this month's RHS magazine might explain why.
Apparently bumblebees are the sole pollinators of early broad beans! We have a couple of pollinating bee logs in the garden, but these are designed for mason bees rather than bumblebees. We have plenty of wild garden and grow all the plants recommended by English Nature (buddleia, cornflower, lavender, honeysuckle, rosemary and foxgloves), but only the rosemary is currently in flower. For next year I am going to try underplanting with some Crocus chrysanthus 'Cream Beauty', which Val recommends for early nectar.