Mix together flour and bicarb. Drop in egg yolks and mix while adding milk. Mix till smooth. Let sit for between 30-60 minutes (go back to bed in the meantime!).
Beat egg whites with an electric mixer till stiff. Add a spoonful of egg whites to the yolk/flour mixture and stir gently. Add the melted butter in a thin stream, still stirring. Fold in the remaining egg whites ever-so-gently, mixing until just combined.
Heat a non-stick pan or swipe a butter-soaked kitchen paper over a regular pan. Drop the desired sized portions on heated pan. Turn when little air bubbles burst on the uncooked side. Cook for about 5 seconds on the other side - DON'T press with the spatula...this would keep them from rising so beautifully.