Posted: 21/08/2016 at 17:22
Runner beans are greedy, thirsty and need a reasonable root space JACKIE
It's not just about feeding with fertilisers. The soil needs to be as rich as possible......next year mix in dried manure,,fish blood and bone and even a few pellets of chicken manure. They need regular watering...again, if your compost is ordinary multi pirpose compost it will dry out very quickly no matter how often you water.
space? As big a pot as possible with plenty of depth.
then you can give supplementary feed with tomato fertiliser or seaweed.
I think these are the reasons your plants run out of steam