Cook the pasta according to the packet instructions, then drain and keep warm.
Meanwhile finely chop the celery, onion, carrot and red pepper. Remove & discard the skin of the chorizo and dice.
Heat the oil in a heave-based pan, add the chorizo and chopped veggies. Gently sauté, under cover, for 10-15 minutes until the chorizo realise its fat and the veggies are tender. Add the tomatoes, tomato purée and a dash of water. Cook for a further 5 minutes, until the tomatoes release their juices.
Meanwhile cut the beans into 2cm pieces. Add these to the sauce, season to taste and add more water if the sauce is sticky. Sauté for a further 5 minutes, until the beans are tender.
Add the shrimps, put the lid on and cook until they change colour (or warm through if using pre-cooked prawns).
Serve with chopped parsley.