Cook the pasta in a large pan of boiling salted water following the manufacturer’s instructions until al dente.
At the same time heat half of the olive oil in a large, heavy-bottomed frying pan and add the garlic and chilli. Soften without colouring for a couple minutes then add the prawns and cook for a couple more minutes stirring constantly.
Add the wine, lemon juice, half of the chopped parsley, white and brown crab meat and season generously. Bring to a gentle simmer and thoroughly warm through.
When the pasta is cooked, drain and return to the pan with the crab and prawn sauce, the remaining parsley and mix. Serve immediately in bowls.