Mix together the dry ingredients in a saucepan, then add the water, mixing until smooth.
Add your chosen food colouring (bear in mind this will stain a wooden spoon), followed by the oil, and cook on a medium heat, stirring constantly, until the dough leaves the sides of the pan and forms into a ball.
Allow to cool before use. Use a wipe-clean mat or PVC tablecloth to avoid staining your table. Then get out the cookie cutters and a rolling pin and away you go!
To keep your play dough in good condition, place it in a sealed plastic bag or container and pop it in the fridge, ready to use next time.