Roasted pork chops with sage & champ

INGREDIENTS

• 1 kg potatoes, peeled, halved
• 4 higher-welfare pork loin chops, skin and fat on
• olive oil
• 1 small bunch fresh sage, leaves picked
• 1 large bunch watercress
• 300 ml milk
• 2 bay leaves
• 1 sprig fresh parsley, chopped
• 4 spring onions, thinly sliced
• a little butter, melted, to serve