I stuck a couple of French beans in the ex potato containers, theory being that even if the plants come to nought with a crop they will give some nitrogen back to the soil ready for next year.
Thanks, that's a goo idea. It's a raised bed and the peas are now coming along - lost a couple of plants to slugs, though in part that was because they got lost under huge potato growth. We had one bean plant my daughter brought back from school that got attacked, but now it is growing bigger, there are signs of new growth at the top, so I'm leaving it in for a while. More peas and beans might be best and easiest for now. The kids will eat the peas off the plant, and as you say, it helps the soil.