Put the seafood into a bowl and stir in the fish & soya sauces. Set aside to marinate.
Spray the oil into a deep, heavy bottomed pan and heat gently. Cut up the leek, garlic and mushrooms quite finely; add to the pot, stir and cover to allow to sweat for about 6-7 minutes.
In the meantime, chop the other veg then add to the pan. Stir thoroughly and cover again. Keep the heat medium low and stir every few minutes to prevent catching.
After 15 minutes add the seafood and mix together well. Cover and cook for another 5 minutes then serve.