Real English Fish And Chips With Yorkshire Beer Batter Recipe - 4 cod fish fillets or 4 haddock fillets  6 ounces plain flour  1 teaspoon bicarbonate of soda  1 (8 fluid ounce) bottle british beer, Small  1/2 lemon, juice of  salt &amp; pepper  extra flour  3 lbs potatoes, peeled &amp; chipped  good quality cooking fat or oil