Heat a wok or large frying pan over a high heat, then add the vegetable oil. Add the ginger and the chopped chillies and stir-fry for 30 seconds.
Add the mushrooms and stir-fry for 2 minutes, then add the curry powder and prawns and stir-fry for a further 2-3 minutes.
Add the mixed pepper stir-fry and cook, stirring, for 2 minutes. Stir in the soy sauce and rice noodles and heat through for 1 minute.
Squeeze in the juice of half the lime and toss well. Scatter over the reserved chilli and serve with the remaining lime, cut into wedges.