runner bean issues

You could try spraying the plants with a solution of Epsom salts. The guy who had the allotment next to ours swore by it. It encourages them to produce clorophorm.

Monty was saying something about beans on Gardeners World this evening, I don't know what sorry as I was wasn't listening properly. Good luck.

Where are you - have you had any particularly chilly nights this week that might have affected them?

have you watered the leaves? burning....