If you are currently employed elsewhere and actively seeking a new job, the interviewers are curious why. They want to see if you are unhappy with your job, employer, or other circumstances. Perhaps your commute is too long and interferes with your personal life, or there is no room for advancement within the organization. The interviewers want to know your reason to determine if you will be a good fit for the NHS and the company culture. When providing your answer, be sure you do not speak poorly of your employer, colleagues, customers, and upper management, as that will make you look disrespectful.