Which variety of runner bean is best in a heatwave

thanks Shiney for the tip on runner beans (armstrong) my runners have not done so well. it looks awefull, will try next year. POTATOES AND BEETROOT have done very well. FANCY
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I have never tried this, so don't know how well it works.
I was advised by a friend that a good trick for runner beans is to dig a deep trench just before planting and as well as putting compost just before you plant the beans, put a thick layer of newspaper which has been soaked in water.
Whilst this will eventually rot down, until it does it will act in a similar way to the water retaining crystals you can buy for containers?
It may be something worth trying for next year's beans.