Just checked on the HDRA/Garden Organic website. And they suggest to do nothing. Usually plants shrug it off. Just give the plants the best growing conditions.
If you save your own seeds, dry them very carefully until they are absolutely dry (a couple of months) and then put them in an airtight jar with a dessicant (the little bags that come in shoe boxes and new handbags - alternatively you can use rice) and stick them in the freezer for 2 days or longer. This kills any surviving beetles and eggs.
There are broad bean beetles (common), pea weevils and bean weevils (rarer, but happens, especially in a warm year). Variations on the same theme, but all of them eat plant leaves and leave notches and all of them survive in seeds, unless frozen. They eat seeds and leave holes in them.
If you don't save your own seeds, don't worry. If you do, check them from time to time or freeze.