After checking the sun exposure, soil, soil pH, and watering, Alf, I would try feeding with tomato food, since runner beans will make their own nitrogen fertilizer, if the proper bacteria are present. If it doesn't perk up from that, give this crop some fish emulsion for the nitrogen, and use a soil inoculant when planting next year, to add nitrogen fixing bacteria around the roots.

Thanks a lot I will try these things

Our runner beans are only just starting to set flowers. Runners beans are a pain in the mikta! They take far to long to establish and set flowers and beans. I doubt we will grow again - dwarf french beans much easier, though still a challenge in the north of Scotland!

Sorry, Alf. I should have asked if the vines looked healthy, but they just weren't bearing. As MG says, that may just mean that they aren't old enough. We mostly grow bush snap beans (including French) here, because the summer keeps cutting off our spring crop, and the winter keeps cutting off our fall crop!

And I'd ask whether you trenched them - meaning did you dig out a deep trench, fill it with good, well rotted compost, back fill and then plant the beans in that.