As they've been causing so much havoc, I've been doing more research and found out that they're not bean beetles. They're bean weevils:
That picture of what they did to the beans is exactly what's going on with our favas. Really damaged this year's crop.
Now it's time to research organic controls!
One of the nice things (!) about these weevils is that they don't kill the bean. So while you may not be able to serve 'em in your pub (which is what we wanted to do) you can still plant the bean. Furthermore, unless they die in it, they'll leave the bean so you can still use 'em. Heck, you can still use 'em anyway :-)