Heat oil in large nonstick frying pan. Add onion, pepper, garlic and bacon pieces, and cook over gentle heat for 5 minutes. Add tomato and cook 2 minutes.
Add rice and stir to coat in oil. Add saffron threads and heat for a few seconds, then pour in hot stock. Bring to boil, then stir lightly and simmer 5 minutes.
Mix in frozen seafood, return to gentle simmer and cook until rice is tender and liquid absorbed, stirring occasionally.