This study will investigate the safety and pharmacokinetics (PK) of a single dose of GSK2256294 in healthy young and elderly subjects to explore the effects of food, gender and age on drug exposure. The biliary metabolites in healthy young males will be investigated using the Entero-test after a single oral dose of GSK2256294. This study will be conducted in two cohorts (Cohort 1 and Cohort 2). Cohort 1 is open label in order to characterise the PK profile of GSK2256294 in healthy young males and also to investigate the biliary metabolites of GSK2256294. Cohort 2 uses a crossover design to allow comparison of the PK parameters of GSK2256294 between in the fed and fasted state within subject and also to compare the PK parameters of GSK2256294 between male and female subjects. A washout period of a minimum of 2 weeks has been chosen to allow and adequate washout of GSK2256294.