Preheat the grill. Place the fish on an oiled baking sheet and season with a little salt and black pepper. Place the streaky rashers alongside the fish. Grill for about 5-6 minutes until the fish flakes easily and the bacon is crispy. Cook the beans in a saucepan of boiling water for a couple of minutes then drain and keep warm. Place the garlic, mustard, chives, tarragon, vinegar, oil and a little salt and pepper in a jam jar. Shake to combine. Cut each lettuce into four and divide between four serving plates along with the eggs and beans. Flake the fish and roughly chop the bacon. Add to the plates then drizzle over the dressing and serve while still warm.