Mitch Tonks's Fish Pie
Ingredients For the mashed potatoes 1kg/2lb 4oz potatoes, cut into 5cm/2in chunks 50g/2oz butter 100g/3½ oz crème fraîche 3 tbsp warm milk pinch salt and white pepper For the filling 500ml/1 pint milk 250g/9oz smoked haddock 200g/7oz cod loin…