Still in year 1, so not so much groundwork to do so far. I went with larger pens where possible, have 7 roughly 30m x20m pens and another pen double this size for the boar and dry sows. Must say I'm really amazed how well the grass has lasted (albeit a great year for grass).
General maintenance includes stripping thistles, when pigs move out of pens will harrow or top the grass. I put electric wire along the bottom of the stock fence to save undermining it but do need to fill in a few holes near the water troughs.
Some time in October will move the larger pigs onto a patch of land planted the other week with stubble turnips, hoping to save the grass pens over winter