I have a small square garden space 4x4 meters, where I just took of pavement slabs and stones to reveal a mixture of aggregate, pebbles and clay under a 20-25 cm of soil, not the best grade, though. I need to improve drainage, as I'm preparing to lay turf. I've dug the 30cm of the material that was there and waiting for Horticultural grit, composted manure and high grade top soil (it will be raised compared to old slabs level). The plan is to shape the slope in a way that follows natural hill (left to right downwards, for this context) and at the right end create a bedding that will host some water hungry plants to help get the moisture out.
Here is my question, is this right approach, given excavation, drainage and any heavy labour are out of question.
I'm located in North West England, we have a mix of good sunny weather, but also a fair bit of rainfall.
If the weather is good the end of the slope I'm planning to use for natural, plant based drainage gets sun blasting from 8am to 3pm March to September. We usually don't get winter temperatures below 0'C, but it rains a lot.
If so, what garden plants would allow me to drag water from shallow ground and disperse it in air (dry the ground out, basically)?