flea beetle attack!

My broad bean seedlings are being chewed by flea beetle. Does anybody have any advice on how to control this pest please.
Trunkie

Thanks Gremlin
Some of the old hands down at the allotment said the same thing. I have planted nasturtiums as a companion plant, they are supposed to pull the black fly away from the beans.
Trunkie

Ah, I wondered what is was that was having a nibble of my broadies!

I had a tray of salad growig last year and took it out of the greenhouse on a sunny day only to come back a few hours later to find it covered in flea beetles the salad crops never recovered dispite me squishing the bugs for days. As soon as you go near them the jump off the plants into the soil