The interviewers mention that many qualified candidates are interviewing for the same position. You want to avoid speaking negatively of the other candidates or sounding arrogant when responding to this question. However, you want to sell yourself in the interview, but not while making the interviewers think you will be a challenging person to work with.
Review the job announcement before your interview and highlight the qualities, experience, and education the NHS seeks in an employee. Then, focus on using those keywords in your response while highlighting unique attributes that make you a better candidate than others.