I'm not familiar with hestia beans but I asked Google and T&M's website says each plant has a spread of 30cm so they need a 30cm diameter space each. That means a 40cm pot is probably only big enough for one plant. If you're starting them now, it's too cold for them outside so it's probably best to start them in smaller pots under cover (windowsill or heated greenhouse) and harden them off and plant out into the big pots when it's warm enough (end of May here, maybe earlier for you if you live in a mild area).
Doncaster, South Yorkshire. Soil type: sandy, well-drained
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