I wondered where you'd got to. I hold you personally responsible for all this fighting you know.
I would just spray with a fatty acids based insecticide if the infestation is bad enough to be affecting the plants. I had blackfly on my beans one year and this did the trick. I haven't experienced aphids on peas - is it possible they're growing too soft? (Too much fertiliser?) Fatty acid insecticides don't kill the goodies like ladybirds and lacewings. I use a product called Organic Pest Control by Bio. It's completely harmless to humans so you don't have to wait before harvesting.
Hope this helps.