Cook the potatoes in boiling water 12-15 minutes until just tender, then drain and set aside.
Mist a large pan with cooking spray over a medium heat. Add the pork chops and garlic and cook 3 minutes, then turn and cook 2 minutes until golden and cooked through. Transfer to a plate and set aside.
Mist the pan with more cooking spray, add the leeks and cook 4-5 minutes until softened. Stir in both mustards, the crème fraîche and the lemon zest.
Season, bring to a simmer, stir in the parsley, then remove from the heat.
Scatter over extra parsley and serve with leeks, new potatoes and lemon wedges.