The Unani system of medicine: does it have a scientific basis?

The Unani system of medicine is claimed to be an effective management protocol for the treatment of stroke using herbal remedies. Although effective, the method does not require invasive intervention nor has it any side effects. Researchers at the University of Westminster, London, have embarked on a project to scientifically validate this stroke remedy. However, such herbal treatments are often considered to be non-scientific and represent 'quack' medicine. So, is there evidence that Unani medicine works