Preheat the oven to 190°C/ 375°F/Gas mark 5. Lightly grease a baking tray.
Put the raisins in a saucepan, cover with water and cook until tender. Cool in their liquid.
Sift the flour and add the baking powder, cinnamon and salt.
Cream the butter and sugar until light and fluffy. Add the eggs, one at a time, beating well between each addition. Blend in the flour mixture. Add the oatmeal and fold in the raisins.
Drop a teaspoonful of mixture at a time onto the baking tray. Bake for 10 minutes or until barely brown. Cool and store in layers, with waxed paper in between.