Examine the Effect of Repeat Inhaled Doses of GW870086X on Lung Function in Mild Asthmatic Male Subjects

Inclusion criteria: * Male subjects aged 18-55 * Documented history of bronchial asthma diagnosed at least 6 months ago. * Only being treated with short-acting beta-2-agonist therapy e.g. Ventolin * Documented sensitivity to adenosine mono phosphate (AMP) at screening visit * Demonstrate repeatable and reproducable response to inhaled AMP at the run-in visit Exclusion criteria: * Any significant illness or disease * History of life threatening asthma * History of respiratory tract infection * Subjects who take medication for their asthma, or other conditions, not compatible with this study. * Smoker * Subjects who are oversensitive to corticosteroids * History of drug or alcohol abuse * Donated blood within last 3 months * Been involved in another clinical trial during the last 3 months * Subjects who work night shifts * Subjects who are undergoing de-sensitisation therapy