Runner beans and climbing beans have stopped growing - help!

I've always been very successful when it comes to growing runner beans/climbing beans but the last few years have been a disaster.
I've sown seed inside and planted out when the weather has been good but then they stopped growing.
So the following year I sowed directly into the soil - they came up quickly & robust but then after 3 inches stopped growing. It took me 3 sowings to get any results.
This year I sowed directly into the soil again, got a couple of inches of good healthy growth and once again they have stopped growing (this was BEFORE our heatwave).
It is new seed every year and I've tried different varieties, the soil is good with plenty of organic matter, good slug control (beer) and well watered (hosepipe).
I'm obviously doing something wrong but what? Could it be the cold water from the hose? (I know the lovely Mr Monty Don said beans must be transplanted out when the soil warms up other wise they "stall" and stop growing 'cus of the shock of the cold soil.)
Are my beans ever going to start growing again or should I just cut my losses and rip 'em out?
Does anyone else have this problem?
Posts
I sowed some direct and they didn't even germinate despite warm soil and lots of rain between sunny spells.
"We don't stop playing because we grow old; we grow old because we stop playing." - George Bernard Shaw
I blame the weather or my dog - as I do for most things
Billericay - Essex
Knowledge is knowing that a tomato is a fruit.
Wisdom is not putting it in a fruit salad.