Stroke is the third commonest cause of death and the leading cause of severe disability in the community. About half of all patients following an acute stroke have difficulty swallowing and in some cases food is "inhaled" into the lungs. We know that patients with swallowing problems suffer an increased risk of chest infection, poor nutrition and a longer stay in hospital. But in some patients, food and liquid are going down into their lungs despite an apparently normal swallow — a process called silent aspiration. The aim of this research is to determine how common it is to inhale food silently after stroke, and whether it affects patient recovery.