Cut the whale meat up, and place in a large kettle and cover with water (or use slow cooker). Add bay leaf, celery, peppercorns and 1 tablespoon salt. Bring to boil, cover and cook over low heat for 2 hours or until the meat is tender.
Melt the butter in a saucepan, add flour and stir until blended. Add light cream, pepper and salt. Cook stirring, until thickened.
Arrange whale meat pieces, onions, mushrooms, peas and pimentos in 2 quart casserole. Add sauce to within 1 inch of top.
Prepare the pastry mix. Cut pastry circle 1/2 inch larger than casserole and place over the whale-mixture, turning edge of pastry under and pressing to casserole with fork or spoon.
Bake in preheated 450 degree oven 15 min. or until crust is golden brown.
Serves 4 to 6 .