Broad beans not setting

[jjat8cv]

I grew The Sutton broad bean in a small polytunnel over winter. One of the plants (obviously a rogue seed) has grown to over five feet tall and still growing. This plant already has about a dozen small beans on it but there is nothing on the others. I  have also picked Douce Provence peas sown in November and very nice they were too. A product of the mild winter presumably.