Pea Moth season
Early planting of Peas can sometimes miss the main Pea Moth season but main crops are vulnerable. You can cover up the crop with fleece to prevent the Pea Moths getting to the crop. There are also Pea moth pheromone traps, which Harrod will be launching next year, which you might like to consider. These will give advance warning of the problem and help reduce numbers. A combination of their traps and fleece is the best solution as no effective insecticides are available.
I hope this helps.