Put the tomatoes into a large mixing bowl with the olives and garlic. Add the anchovies if using.Add a few lugs of good quality extra virgin olive oil.
Season to taste and stir gently to mix.
Cook the pasta according to packet instuctions until tender. Drain, then immediately add to the tomatoes and stir together. Let it sit for a couple of minutes for the pasta to absorb the flavours.
Stir again and check the seasoning. Sprinkle with the oregano to serve.