Heat oven to 220C/200C fan/gas 7. Put 1 slice of pancetta on a chopping board and stretch out using the back of a knife. Put 1 sage leaf and 1 sausage on top, and roll the sausage up on the diagonal, covering all of it. Put on a lightly greased baking sheet and repeat with the remaining sausages. Can be prepared and chilled 2 days ahead. Cook for 20-25 mins until crisp and cooked through.