Heat oil in a large heavy pan and fry the gammon, onion, pepper and celery for about 10 minutes until soft.
Add the flour, stirring now and then.
Add in the rice.
Pour in the tomatoes, stir and scrape the bottom of the pan over the rice and vegetables.
Add in the chicken stock and seasoning, stir, and bring to the boil.
Reduce the heat, cover, and simmer gently for 15 minutes.
Stir in the shrimp & crab meat and cook for 3 minutes.
Take off the heat and stir in the fresh coriander or parsley.
Serving Suggestions: Sprinkle some fresh coriander, serve hot.