This position requires out-of-town travel at times. Will traveling be a problem for you?

If the interviewers ask this question, they want to ensure you know the job requirements regarding travel and see that it will not be an issue if hired. Often, project managers will need to travel to attend work-related conferences or inspect an offsite project. If travelling is one of the job requirements, the NHS should have put that in the job description, so it should not surprise you in the interview.