Put a large pan of salted water on to boil.
In a frying pan heat half the olive oil and pan-fry the breadcrumbs until golden.
Meanwhile, heat another pan and add the remaining olive oil, sliced garlic, chilli flakes if using and anchovies. Fry very gently for a minute or so. Add in the lemon zest and stir. Take off the heat.
Cook your pasta according to packet instructions reserving a little cooking water.
Put the drained pasta in the anchovy sauce adding a little cooking water to loosen. Toss together with most of your chopped parsley. Reserve a little for decoration.
Serve immediately topped with crispy breadcrumbs, a squeeze of lemon juice and a drizzle of olive oil. Finally, sprinkle the rest of your chopped parsley on top