Cook noodles according to package directions; drain. In 2 quart microwavable casserole microwave (HIGH) margarine 25 seconds; stir in onion and green pepper. Microwave (HIGH), covered, 1 1/2 minutes. Gently stir in noodles, tuna, soup, peas, 1/2 cup cheese, milk and Worcestershire. Microwave (HIGH), covered, 5 minutes; stir. Recover; microwave (HIGH) until hot and bubbly (4-5 minutes). Sprinkle with remaining cheese. Let stand, covered, until cheese melts, (about 2 minutes).