yake the pork out of the wrapping and dry the skin thoroughly with kitchen towel. leave to stand for a few hours at room temp (cover with a loose layer of foil if needed)
before putting the oven, dry again then score the skin with a VERY sharp knife...even if it's already scored.
Then drizzle a bit of olive oil over the skin and rub all over the skin.
Finally give a generous sprinkle of salt over the entire skin and rub well into the slits you made earlier. Repeat a couple of times.
if you find the skin isn't going crisp, i remove it from the meat and cook it in a seperate tin in the oven.