my potatoes and broad beans have suddenly started to wilt and die

Question

plants where all doing well then all of a sudden they have started dying

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Answer 1

Make sure that watering is proper and that the soil is well draining.
This could be a blight.
Review the care below in the articles below.

https://www.gardeningknowhow.com/edible/vegetables/potato/how-to-grow-potatoes-when-to-plant-potatoes.htm
https://www.gardeningknowhow.com/edible/vegetables/potato/potato-blight-diseases.htm
https://www.gardeningknowhow.com/edible/vegetables/beans/growing-fava-beans.htm