The interviewers will ask this question if one of the job duties is to train and supervise others. Most NHS Band 7 physiotherapist job openings on the UK Indeed website have training and supervising junior physiotherapists and other support staff as a job duty. The interviewers want to determine your experience and qualifications in a teaching capacity to see if you will be a good fit for their organization.
Focus on describing your years of experience training others and in what capacity. Explain if you have taught and mentored new physiotherapists, provided continuing education training, or trained other healthcare team members.