Cook the pasta in boiling salted water until al dente approx. 15 mins, drain and either refresh in cold water or add a splash of olive oil and keep to one side whilst you finish the sauce.
Whilst the pasta is cooking in a large saucepan heat the olive oil. Add the garlic and chilli and cook gently taking care not to burn the garlic, add the chopped tomatoes and brown crab meat, bring to the boil and simmer for 5 or 6 minutes.
Add the white crab meat, cooked cockles, mussels to the sauce and toss in the pasta.
Serve with lots of freshly chopped parsley and lemon.