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https://www.lawnsmith.co.uk/lawn-care-videos/aerate-rake-scarify/spike-core-aerate.htm
No need to dig, get one of these and a bag of sand. Grass grows ok on clay, just keep mowing.
My lawn is mostly pretty damp clay London stuff. I've read that you can try to improve drainage by digging grit and organics into it. I can't do that (as it's my lawn, and it's covered in grass and moss...).
I thought about getting one of those big augers that you use for 'drilling' fence post holes, and filling the resultant holes up with grit (topped off with soil / grass seed) to get a few big drainage holes that would hopefully reach through the clay into better draining stuff. Does this sound plausible / useful?