Brush each fish all over with about ½ tbsp olive oil and season, inside and out
Pre-heat the grill to maximum. Cook the fish for 6 minutes, then turn and cook for a further 6 minutes, until the skin is golden and the white flesh flakes easily
Meanwhile, zest one lemon and squeeze the juice into a bowl with the remaining olive oil and herbs. Season to taste
Cut the remaining lemon into wedges, and serve the grilled fish with the lemon dressing