The NHS invests a lot of money in advertising its job openings. The interviewers are curious to hear what methods are effective and which are not. They also want to hear if an employee of the NHS referred you. Some NHS trusts offer their employees a referral fee when referring a candidate, while others hire recruiters to seek qualified candidates. Describe how you heard about the position, and be sure to give the name of the employee or recruiter who referred you if applicable. If you saw the job advertised on a job website like Glassdoor or Indeed or on the NHS career page on their website, be sure to let the interviewers know.