Cook the gluten free spaghetti as per the pack instructions in boiling, salted water. I usually find this takes 8-12 minutes (depending on the brand) once added to the boiling water.
While the spaghetti is cooking, add the olive oil to a large pan and place on a medium heat. Add the garlic and chilli flakes and fry gently for 3-4 minutes.
Add the sardines in tomato sauce to the pan as well as the tinned tomatoes, capers and olives. Mix well, breaking up the flesh of the fish a bit, and simmer until the pasta is cooked.
Drain the spaghetti and add to the pan. Mix well and serve garnished with lots of fresh chopped parsley and some parmesan cheese.
Notes
I like to add 2 tins of sardines between 2 people to up the protein content and also because we just love sardines! If you're new to eating tinned sardines or aren't sure how 'fishy' you like it, I'd recommend starting with 1 tin and then you can always add more the next time you make this!