Cover chickpeas in plenty of cold water and leave to soak overnight or for 6 hours. Drain thoroughly.
In a food processor place chickpeas, bread, garlic, parsley, coriander, onion and spices. Blend well until a smooth paste is formed. At this point the mixture can be frozen for later use.
Mix baking soda into the mixture just before cooking.
Form mixture into walnut sized balls and flatten slightly.
Heat oil in a large frying pan and cook falafel until browned on each side and cooked through.