Hi there Compo. Sounds brilliant, I wish you the best of luck. I wouldn't worry about the bhorse muck lying around especially if you not intending to plant things yet. Just plough it in and let the worms and soil bacteria get to work on it. By the time your ready to start planting there will be no sign of it.
Just be aware that when planting potatoes in what was previously grass land there can be a problem with wire worm. Cultivation soon gets rid of them but they might be a pest in the first season. Please don't let that bother you, it should not put you off, what sound like a great venture.
Go for it and have fun. It would be worth doing just to have a go with the old tractor and plough. It's an allotmenteers fantasy. Enjoy it.
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