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Ah I see what you mean, but I'm not keen on raised beds and the level needs to come up about 200mm anyway so plenty of capacity for good stuff. I actually heard a bloke on gardeners question time saying how good clay can be if you just add enough organic matter, which chimes with my experience at my allotment where I've much better soil on the half I've added more to and still muddy or rock hard on the half I haven't.
I think the huge oak at the back will soak up a lot in winter if I can move water in that direction.
I know, we live in an area of clay soil, there are clay pits around here now fishing lakes. Our new planting areas are in raised beds where I don't have the problems of very clay soil it's possible to make bricks out of.