Prepare noodles as directed on packet. Drain, rinse under cold water, then drain well. Roughly cut into shorter lengths with kitchen scissors.
Heat oil in a medium non-stick frying pan over medium-high heat. Add fish. Cook fillets for about 3 minutes on each side or until light golden and just cooked through. Transfer to a plate. Cool slightly, then break into small flakes.
To make dressing, whisk all ingredients in small jug until combined.
Combine cabbage, beans, onion, herbs, fish and half the dressing in a large bowl. Toss well.
Spoon fish larb over noodles. Drizzle with remaining dressing. Sprinkle with peanuts and extra herbs. Serve with lime wedges.