Dry the pork belly's skin with kitchen roll/paper then place onto a plate & leave in the fridge overnight, uncovered.
The next day, preheat an oven to 150°c/130°c fan (302°f/266°f).
Line the bottom of a large roasting tin with baking paper, set the pork belly on top, skin side up then sprinkle the ½ tsp of table salt all over the skin.
Next, pour the cider around the pork belly, making sure not to get any on the skin.
Cut the skin off the orange then add into the cider along with the bay leaves, cloves, star anise & peppercorns. Juice the orange & add a tbsp of juice into the cider as well.
Place a sheet of baking paper over the pork belly then cover the roasting tin with tin foil.
Cook for 3-3½ hours, until the pork is tender. If you insert a food probe or skewer into the meat, it will feel incredibly soft.
Take the pork out of the oven, remove the tin foil & top piece of baking paper then leave to cool for 20 minutes or so (it should be cool enough to handle but not completely cool).
Next, wrap the pork belly in a double layer of clingfilm then place into a baking tin. Place another tin on top then weigh it down with something heavy*.*Anything heavy will work (tins, bags of flour, etc.), as long as it weighs at least a couple of kilos. Let the pork press at room temperature until cool enough to go in the fridge then refrigerate overnight (whilst still weighed down).