Digging out the bean trench. There is about a spade depth of top soil, then heavy clay subsoil. I broke this up as far as possible to try and improve the drainage.
The trench was lined with two bin bags of shredded paper, part filled with kitchen waste and semi-rotted compost, then back filled with the original soil.This will settle back close to ground level so I've marked it with a couple of pegs. By the time peas and beans are sowed and planted in May, it should be a rich reservoir of moist plant food.