Cook the pasta in a large saucepan of salted boiling water according to packet instructions until al dente.
Meanwhile, heat the oil in a large frying pan over a medium heat and add the garlic, chillies, tomatoes, olives and thyme. Bring to the boil and simmer for 5 minutes. Break the tuna up with a fork and stir into the sauce. Simmer for 2 minutes, then season with salt and pepper.
Drain the pasta, then toss into the sauce. Serve immediately, with the bottle of extra virgin olive oil for anyone to drizzle a little oil on to their serving if they like.